Italian Watermelon, Shrimp and Avocado Salad | Insalata di Anguria, Gamberi e Avocado
This salad exists because of a Sicilian coincidence. The plain behind Catania grows watermelon in quantity, the volcanic terraces a short drive north grow avocado, and the boats at Mazara del Vallo, on the opposite coast, land some of the best prawns in the Mediterranean. Put the three together with lemon, good olive oil and a little fresh chilli and you get a plate that could not have been made in Italy before the 1960s.
What decides whether it works is water. Watermelon is more than nine tenths liquid and carries almost no acidity, and left alone with the fat of the avocado it collapses into a pink puddle within five minutes. The method below intervenes three times: the melon is salted and drained, the prawns are brined and barely cooked, and the dressing is built thick enough to cling instead of run.
Serve it as a contorno beside grilled fish or on its own as a light antipasto, cold but never frozen, dressed at the last possible moment.
Yield: 4 side servings. Prep: 30 minutes. Cook: 3 minutes. Rest: 30 minutes for the melon and the brine. Total: about 1 hour. Difficulty: easy to intermediate. Course: contorno or light antipasto. Season: July to the first week of September.
The Story
Avocado is the newcomer and the reason this salad has a date attached to it. Trials began on the Ionian slope of Etna in the early 1960s, on the strip of volcanic land running through Giarre, Fiumefreddo di Sicilia and Riposto, where the sea keeps winters mild and the black soil drains fast enough to suit a tree that hates wet feet. The plantings stayed small for thirty years. Then demand caught up, and Sicilian avocado, picked ripe rather than shipped green from another hemisphere, became a local ingredient rather than an import.
Watermelon has been on the island far longer. It arrived with Arab agriculture and the irrigation works that reshaped Sicilian farming between the ninth and eleventh centuries, and it kept the dialect name muluni d'acqua long after standard Italian settled on anguria. It has always been food for the hottest weeks, sold in slices from carts and grown across the Piana di Catania and the flat land behind Siracusa, where relentless sun produces fruit with a high sugar reading and a grain firm enough to hold a knife cut.
The prawn supplies the third point and the oldest habit. Mazara del Vallo sits on the Sicilian Channel, and its deepwater fleet built the reputation of the gambero rosso, a prawn sweet enough that the local rule has always been to do as little to it as possible: raw with oil, salt and lemon, or seconds rather than minutes in water. Putting that restraint next to the fruit of the plain is a move made in Sicilian seaside kitchens over the last thirty years, but sweetness, salt and citrus have been the island's summer grammar for centuries.
Ingredients
For the shrimp
Raw shrimp, shelled and deveined, 20 to 24 count, 1 lb (450 g)
Water for the brine, 4 cups (950 ml)
Fine sea salt for the brine, 2 tbsp (30 g)
Granulated sugar, 1 tsp (4 g)
Bay leaf, 1
Lemon, 1/2, cut into two pieces
For the watermelon
Seedless watermelon flesh, 1 1/2 lb (680 g) after trimming
Fine sea salt, 1 tsp (6 g)
For the avocado
Ripe Hass avocados, medium, 2
Lemon juice, 1 tbsp (15 ml)
Fine sea salt, 1/4 tsp (1.5 g)
For the dressing
Extra virgin olive oil, 5 tbsp (75 ml)
Lemon juice, 3 tbsp (45 ml)
Finely grated lemon zest, from 1 lemon
Dijon style mustard, 1/2 tsp (3 g)
Mild honey, 1/2 tsp (3 g)
Fresh red chilli, seeded and minced, 1/2 tsp (1 g)
Fine sea salt, 1/2 tsp (3 g)
Freshly ground black pepper, to taste
For finishing
Red onion, small, 1/2, sliced paper thin
White wine vinegar for the onion, 2 tbsp (30 ml)
Wild fennel fronds, chopped, 2 tbsp (5 g)
Mint leaves, small, 10 to 12
Pine nuts, toasted, 2 tbsp (18 g)
Flaky sea salt, a pinch per plate
Preparation
Step 1
Cut and drain the watermelon. Trim the rind and every trace of the pale layer beneath it, which is bitter and watery, then cut the flesh into cubes of about 3/4 inch (2 cm), since cubes hold their edges where thin slices tear. Spread them in a single layer in a colander set over a bowl, scatter the teaspoon of fine sea salt over them and refrigerate for 30 minutes. Discard the juice that collects and pat the cubes dry.
Step 2
Soak the red onion. Slice the half onion as thinly as you can, ideally on a mandoline, and put the slices in a small bowl with the white wine vinegar and a pinch of salt for 20 minutes. The vinegar draws out the harsh sulphur compounds that would otherwise sit on top of everything else, and turns the slices bright pink. Drain and press them gently.
Step 3
Brine the shrimp. Dissolve the 2 tablespoons of salt and the teaspoon of sugar in the cold water, add the bay leaf and the lemon, and submerge the shelled shrimp for 20 minutes in the refrigerator, no longer. The brine seasons the flesh through rather than only on the surface and keeps it firm and translucent. Lift them out, rinse briefly and dry them thoroughly.
Step 4
Poach the shrimp barely at all. Bring a saucepan of unsalted water to a bare simmer, with the surface trembling and no rolling bubbles, and slide the shrimp in. They need 90 seconds to 2 minutes, and they are done when the flesh turns opaque at the thickest point and the body curves into a loose letter C. A tight spiral means they are overcooked. Lift them into iced water for 2 minutes only, then drain and dry again.
Step 5
Build the dressing. Whisk the lemon juice, zest, mustard, honey, chilli, salt and pepper together until the salt has dissolved, then add the olive oil in a thin stream while whisking hard. The mustard and honey are emulsifiers rather than flavours you should be able to name. It should finish like thin cream and coat the back of a spoon.
Step 6
Cut the avocado at the last moment. Halve the avocados, remove the stones and scoop each half out whole with a large spoon run between flesh and skin. Cut them into cubes matching the watermelon and turn them gently with the lemon juice and the quarter teaspoon of salt. Do this only after everything else is ready, because cut avocado discolours within minutes.
Step 7
Dress and assemble. Halve the shrimp lengthways if they are large. In a wide bowl combine the drained watermelon, the avocado and the shrimp, spoon over about two thirds of the dressing and fold twice with a rubber spatula, lifting from underneath rather than stirring. Add the onion, fennel fronds and mint at the very end so they stay visible, and taste before any salt goes on.
Plating
This is a cold plate and the plate itself should be cold. Put four shallow bowls in the refrigerator for 20 minutes before service. A warm plate starts pulling juice out of the watermelon the instant the salad lands on it, and that pool is the commonest reason a good version of this dish looks poor by the time it reaches the table.
Build rather than pour. Lift the dressed mixture with a spoon and a fork and set it in a loose mound slightly off centre, keeping some height so the components read separately. Tuck a few shrimp and the brightest watermelon cubes where they are visible, spoon the remaining dressing around the base and never over the top, and scatter the pine nuts last so they stay crisp. Finish with whole mint leaves, flaky salt on the avocado only, and a thread of raw olive oil.
Professional Technique
The controlling technique is osmotic draining. Salt on the cut surface creates a concentration gradient that pulls free water out of the fruit cells and into the colander. What remains is not desiccated but denser, the same sugars and aromatics in less liquid, which is why drained watermelon tastes more of watermelon than the raw cube it started as. Half an hour is the window: at an hour the cubes go limp and glassy at the edges, and that cannot be reversed.
The second is cooking the shrimp to the lowest temperature that will do the job. Shrimp proteins set between roughly 120°F (49°C) and 140°F (60°C), and past that the muscle fibres contract hard and squeeze out the water that made them juicy. A bare simmer, a short immersion and an immediate transfer to iced water keep the centre inside that band, and two minutes in the ice is the limit before the flesh takes water back on.
The third is dressing viscosity, a structural decision rather than a flavour one. Plain oil and lemon at the classic three to one ratio separates in under a minute and runs off wet fruit. Half a teaspoon each of mustard and honey holds the two phases together and raises the viscosity to the point where the dressing sits on a melon cube instead of sheeting off it.
Texture and Moisture Control
Three textures have to be intact at the table: watermelon crisp and cold, shrimp firm and yielding, avocado creamy but still holding its shape. Each fails through moisture and in a different direction. The melon leaks unless it has been salted and drained. The shrimp turn rubbery if they meet a rolling boil. The avocado turns to paste if it is folded more than twice, because its cell walls are fragile and every extra stir breaks more of them.
Temperature and timing carry the rest. Everything should be refrigerator cold, around 40°F (4°C), when it is dressed, but nothing colder: watermelon held near freezing loses its aroma entirely and tastes of cold sugar, and avocado chilled hard goes waxy on the palate. From the moment the dressing goes on you have about twenty minutes before its salt starts drawing fresh liquid out of both the melon and the shrimp, so fold at the last moment, keep the pine nuts out of the bowl until plating, and dress a crowd in two batches rather than one.
Professional Mise en Place
Almost everything here can be ready an hour ahead and held cold, with only the avocado and the final fold left to the last minute.
Equipment and tools
Colander over a bowl, wide enough for a single layer of melon
Mandoline or a very sharp knife for the onion
Small saucepan and a bowl of iced water beside it
Balloon whisk and a small bowl for the emulsion
Rubber spatula for folding, never a spoon
Prepared ahead
Watermelon cubed, salted, drained and dried, up to 3 hours ahead
Shrimp brined, poached, chilled and dried, up to 4 hours ahead
Dressing whisked, up to 6 hours ahead, rewhisked before use
Red onion soaked and pressed, up to 1 day ahead
Pine nuts toasted, up to 2 days ahead in a sealed jar
Service setup
Plates chilling in the refrigerator for at least 20 minutes
Herbs picked and dried, held between damp paper towel
Avocados at cool room temperature, cut once guests are seated
Dressing divided, one part for the fold and one for the plate
Flaky salt, pepper mill and raw olive oil within reach
Chef Tips
Buy the watermelon whole and heavy for its size, with a large cream coloured patch where it rested on the ground. Precut trays have already lost the juice you are about to control deliberately, and the flesh has usually gone soft at the cut faces.
Test avocado ripeness at the stem, not by squeezing the body. Flick off the small dry cap: green underneath means ready, brown means it has gone too far, and a cap that will not move means another day on the counter. Squeezing bruises the flesh and the bruise shows on the plate.
Buy shell on shrimp and peel them yourself. Shrimp peeled at home have not been sitting in a tray losing texture to water, and the shells give you a five minute stock for the next risotto.
Taste the dressing against a cube of the drained melon rather than off the spoon. On its own it reads sharp and salty, which is correct, since the fruit is sweet and the shrimp are already seasoned. Judged in isolation it tempts cooks to soften it with more oil, and the whole plate goes flat.
Common Mistakes
Skipping the salting and draining. Unsalted watermelon releases its juice after it is dressed rather than before, diluting the emulsion and leaving every component swimming. Half an hour in a colander changes the entire plate.
Boiling the shrimp. A rolling boil contracts the muscle fibres and forces out moisture, which is why boiled shrimp curl into a closed spiral and squeak against the teeth. Keep the water at a bare simmer and count seconds, not minutes.
Cutting the avocado early. Exposed avocado browns through enzymatic oxidation within minutes and lemon juice only slows it. Cut it once the melon is drained, the shrimp are cold and the dressing is whisked.
Overmixing the salad. Every extra fold breaks more avocado cells and more melon edges, and three distinct ingredients turn into a uniform pink mash. Two folds with a rubber spatula, lifting from the bottom, is the maximum.
Using a sharp vinegar in the dressing. Wine vinegar is too aggressive against watermelon and bullies the prawn off the plate. Lemon juice and zest give the acidity with the aromatics that belong here, and the vinegar stays where it is useful, in the onion soak.
Dressing the salad ahead of service. Twenty minutes after the dressing goes on, its salt has begun pulling liquid out of the melon and the shrimp again. Hold the components separately and fold only when the plates are on the pass.
Wine Pairing
Grillo Sicilia DOC: The home bottle and the most direct answer. Grillo carries real weight for a white, with ripe citrus and a faint herbal edge, and that body lets it stand up to the avocado instead of vanishing under it. Its acidity meets the lemon on level terms, and the salinity of coastal bottles sits naturally beside shrimp.
Etna Bianco DOC: Carricante grown on volcanic soil gives a white with cutting acidity and a stony austerity that works as a counterweight rather than a partner. Where the salad is sweet and rich, this wine is lean and mineral, and the contrast keeps resetting the palate. It also has the aromatic restraint a plate carrying mint and wild fennel needs.
Cerasuolo d'Abruzzo DOC: A rosato of genuine colour and structure, made from Montepulciano and far more substantial than its shade suggests. Its red fruit answers the watermelon directly, which few whites can do, while the tannic grip left by brief skin contact cuts avocado fat in a way acidity alone does not. Serve it at about 50°F (10°C).
Riviera Ligure di Ponente Pigato DOC: Pigato brings something the Sicilian whites do not: a herbal character of wild fennel and dried Mediterranean scrub that runs straight alongside the fennel fronds and mint in the salad. There is enough texture to handle the avocado, and the bitter almond finish stops the sweetness of the melon from dominating the aftertaste.
Cirò Bianco DOC: Greco Bianco from the Calabrian coast, light, dry and inexpensive, and the honest everyday choice. Its modest alcohol and clean lemon acidity refresh without adding another flavour to a plate already carrying chilli, citrus, mint and fennel. Open it when you want the salad to be the subject.
Storage & Reheating
Assembled, this salad does not keep, and nothing about it improves with time. Dressed leftovers should be eaten within an hour: the watermelon keeps giving up liquid, the avocado greys, and the shrimp go spongy sitting in an acidic pool. If you expect leftovers, dress only what is going to the table.
Undressed components store well. Drained watermelon keeps in an airtight container in the refrigerator for up to 2 days, poached shrimp for 2 days on a paper lined tray, and the dressing for 5 days with a vigorous rewhisk and ten minutes at room temperature before use. Cut avocado does not store under any circumstances.
Nothing here is reheated and nothing is frozen. Watermelon turns to slush on thawing, avocado separates into water and grey pulp, and cooked shrimp toughen irreversibly if frozen again. Serve the salad cold, taking it out of the refrigerator two or three minutes before the table so the mint and fennel open.
Nutrition
Per serving, based on 4 side servings:
Calories: 390 kcal
Total Fat: 28 g
Saturated Fat: 4 g
Trans Fat: 0 g
Unsaturated Fat: 23 g
Cholesterol: 170 mg
Sodium: 620 mg
Total Carbohydrates: 19 g
Fiber: 7 g
Total Sugars: 10 g
Added Sugars: 0.5 g
Protein: 25 g
Lactose: 0 g
Principal micronutrients: vitamin C, vitamin K, folate, potassium, selenium, vitamin B12, lycopene, vitamin E
These figures are estimates. Most of the brine is discarded rather than eaten, so the real sodium depends on how thoroughly the shrimp are rinsed and how much salting liquid is drained off the melon.
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