Gnocchi di Patate Viola con Capesante Scottate, Bisque di Crostacei e Dragoncello Purple Potato Gnocchi with Seared Scallops, Shellfish Bisque and Tarragon

Gnocchi di Patate Viola con Capesante Scottate, Bisque di Crostacei e Dragoncello Purple Potato Gnocchi with Seared Scallops, Shellfish Bisque and Tarragon

Purple Potato Gnocchi with Seared Scallops, Shellfish Bisque and Tarragon

Story of the Dish

Gnocchi di Patate Viola con Capesante Scottate, Bisque di Crostacei e Dragoncello Purple Potato Gnocchi with Seared Scallops, Shellfish Bisque and Tarragon

Serves: 4

Introduction

This dish combines soft handmade purple potato gnocchi, naturally sweet sea scallops, a concentrated shellfish bisque, and the fresh aromatic character of tarragon.

The success of the dish depends on controlling richness.

The bisque should be intense but refined, with genuine shellfish depth rather than excessive cream. The gnocchi should remain exceptionally light despite their dramatic purple color. The scallops should provide a completely different texture, with natural golden caramelization outside and a moist, tender center.

Tarragon is used sparingly at the end. Its subtle anise character provides freshness and prevents the shellfish sauce from becoming heavy.

Ingredients

For the Purple Potato Gnocchi

1½ pounds purple potatoes

¾ to 1 cup Italian 00 flour, approximately

1 large egg yolk

¼ cup finely grated Parmigiano Reggiano

¼ teaspoon freshly grated nutmeg

1 teaspoon kosher salt, approximately

Semolina flour, for dusting

For the Scallops

12 large dry sea scallops, preferably U10

1 tablespoon extra virgin olive oil

1 tablespoon unsalted butter

Kosher salt, as needed

White pepper, as needed

For the Shellfish Bisque

1 pound raw shrimp, lobster, langoustine, or mixed shellfish shells

2 tablespoons extra virgin olive oil

1 small carrot, roughly chopped

1 celery stalk, roughly chopped

1 small shallot, roughly chopped

1 garlic clove, lightly crushed

1 tablespoon tomato paste

¼ cup Cognac or brandy

¾ cup dry white wine

3 cups light fish or shellfish stock

1 small thyme sprig

1 bay leaf

6 black peppercorns

½ cup heavy cream

2 tablespoons cold unsalted butter

Kosher salt, as needed

For Finishing

1 tablespoon fresh tarragon leaves

1 teaspoon fresh lemon juice

Fresh lemon zest, used sparingly

1 tablespoon excellent extra virgin olive oil

Maldon sea salt, only if necessary

Mise en Place

Prepare the shellfish shells.

Wash and dry the purple potatoes.

Chop the vegetables for the bisque.

Prepare the stock.

Remove the lateral muscles from the scallops if necessary.

Dry the scallops thoroughly and refrigerate uncovered on absorbent paper.

Pick the smallest tarragon leaves for final plating.

Have the bisque completed before cooking the gnocchi and scallops.

The final stages of the dish should happen rapidly.

1. Bake the Purple Potatoes

Preheat the oven to 400°F.

Place the whole unpeeled potatoes on a sheet pan.

Bake approximately 45 to 60 minutes, depending on their size.

A knife should pass through the center without resistance.

Baking is preferable to boiling for gnocchi because it minimizes water absorption.

The less water the potatoes contain, the less flour will be required.

Less flour produces lighter gnocchi.

2. Rice the Potatoes

While the potatoes are still hot enough to handle, remove their skins.

Immediately pass the flesh through a potato ricer.

Do not use a food processor or blender.

Mechanical blades can damage the starch structure and produce a gluey texture.

Spread the riced potatoes across a clean work surface.

Allow excess steam to escape for approximately 5 minutes.

The potatoes should remain warm but should no longer release large quantities of steam.

3. Prepare the Gnocchi Dough

Gather the potatoes gently.

Add the egg yolk, Parmigiano Reggiano, nutmeg, and salt.

Add approximately ¾ cup flour.

Using a bench scraper and your hands, gently bring the ingredients together.

Do not knead the mixture like bread dough.

Add additional flour only if necessary.

The exact amount depends on the moisture content of the potatoes.

The finished dough should be soft, delicate, and just firm enough to handle.

If the dough becomes dense and highly elastic, too much flour has probably been added or the mixture has been overworked.

4. Shape the Gnocchi

Divide the dough into several portions.

On a lightly floured work surface, roll each portion into a rope approximately ¾ inch thick.

Cut into pieces approximately ¾ to 1 inch long.

For this refined preparation, leave them as small pillows rather than heavily ridging them with a fork.

This creates a cleaner presentation and reduces unnecessary handling.

Transfer the gnocchi to a tray lightly dusted with semolina.

Do not stack them.

Keep refrigerated until needed.

5. Roast the Shellfish Shells

Place a heavy saucepan over medium high heat.

Add the olive oil.

Add the shellfish shells.

Cook approximately 6 to 8 minutes, stirring and crushing them periodically with a wooden spoon.

The shells should develop a deep roasted aroma and noticeable color.

This stage creates much of the eventual flavor of the bisque.

Do not rush directly to adding liquid.

6. Add the Aromatic Vegetables

Add the carrot, celery, shallot, and garlic.

Cook approximately 5 minutes.

Allow the vegetables to soften and begin developing light caramelization.

Add the tomato paste.

Cook approximately 2 minutes, stirring continuously.

The tomato paste should darken slightly.

Cooking the tomato paste removes its raw character and develops deeper savory notes.

7. Deglaze with Cognac

Remove the saucepan briefly from direct flame.

Add the Cognac.

Return to the heat.

Allow the Cognac to reduce until almost completely evaporated.

There is no requirement to flambé.

The objective is controlled reduction and flavor development.

Add the white wine.

Reduce by approximately two thirds.

The sharp alcoholic aroma should disappear.

8. Extract the Bisque

Add the fish or shellfish stock.

Add the thyme, bay leaf, and black peppercorns.

Bring to a gentle simmer.

Cook uncovered for approximately 25 to 30 minutes.

Do not aggressively boil the shells.

Do not cook them unnecessarily for hours.

Over extraction can introduce bitterness and muddy the clean shellfish character.

9. Strain and Reduce

Pass the liquid through a fine mesh strainer into a clean saucepan.

Press gently on the shells and vegetables to recover flavorful liquid.

Do not pulverize the solids through the strainer.

Return the strained liquid to medium heat.

Reduce until the flavor becomes concentrated and the liquid begins developing natural body.

The exact reduction will depend on the original stock.

Taste frequently.

10. Finish the Bisque

Add the heavy cream.

Simmer gently until the bisque lightly coats the back of a spoon.

Remove from the heat.

Add the cold butter gradually while whisking.

Add the lemon juice.

Taste.

Adjust with kosher salt only if necessary.

The finished bisque should have concentrated shellfish flavor, moderate richness, and enough acidity to remain clean on the palate.

It should not taste primarily of cream.

11. Prepare the Scallops

Remove the scallops from refrigeration approximately 10 minutes before cooking.

Dry them again thoroughly using clean paper towels.

The surfaces should be almost tacky rather than wet.

Season lightly with kosher salt immediately before cooking.

Do not heavily season them.

The bisque will already provide substantial savory intensity.

12. Cook the Gnocchi

Bring a large pot of salted water to a gentle boil.

Add the gnocchi in manageable batches.

Do not overcrowd the pot.

When the gnocchi rise to the surface, continue cooking approximately 30 to 45 seconds.

Remove with a spider or slotted spoon.

Transfer directly into a wide sauté pan containing several tablespoons of warm bisque.

Add approximately 2 tablespoons gnocchi cooking water.

Gently move the pan.

Do not aggressively toss the gnocchi because their texture is delicate.

The objective is to lightly glaze each piece with bisque.

13. Sear the Scallops

Heat a heavy stainless steel or cast iron skillet over medium high to high heat.

Allow it to become thoroughly hot.

Add the olive oil.

When the oil begins shimmering, place the scallops into the skillet with plenty of space between them.

Do not move them.

Do not press them.

Cook approximately 1½ to 2 minutes on the first side.

The surface should develop a natural golden brown crust with slight variations in color.

Turn once.

Add the butter.

Tilt the skillet and baste the scallops for approximately 30 to 45 seconds.

Remove immediately.

The sides should remain ivory and the centers moist.

Understanding Light Gnocchi

The objective when making potato gnocchi is not to create the strongest possible dough.

It is almost the opposite.

Potatoes provide the structure, while flour is added only in the quantity necessary to hold the gnocchi together.

Water is the enemy.

Wet potatoes require additional flour.

Additional flour produces heavier gnocchi.

This is why baking the potatoes, ricing them while hot, allowing steam to escape, and handling the dough minimally all contribute to a lighter final texture.

The flour measurement in a professional gnocchi recipe should therefore always be understood as a range rather than an absolute quantity.

Understanding the Bisque

A powerful bisque is not created simply by adding more cream or reducing the sauce until it becomes extremely thick.

The foundation is built through:

Proper roasting of the shells

Caramelization of the aromatic vegetables

Cooking the tomato paste

Reduction of Cognac and white wine

Controlled extraction of the shellfish

Final reduction of the strained liquid

Only after those stages should cream and butter be introduced.

This produces intensity without heaviness.

Michelin Style Plating

Use a large warm shallow white bowl.

Spoon approximately 2 to 3 tablespoons shellfish bisque into the center.

The bisque should form a controlled shallow pool.

Arrange approximately 7 to 9 purple potato gnocchi per person through the sauce.

Place three scallops per person among the gnocchi.

Do not stack the scallops.

Keep their naturally caramelized surfaces completely visible.

Add several small fresh tarragon leaves.

Do not scatter large quantities of chopped tarragon across the plate.

Finish with an extremely small amount of fresh lemon zest.

Add several drops of excellent extra virgin olive oil.

If necessary, finish the scallops with a few crystals of Maldon sea salt.

The final presentation should emphasize the contrast between the naturally purple gnocchi, warm shellfish bisque, ivory scallops, golden caramelization, and restrained green tarragon.

Restaurant Service Method

The bisque can be prepared before service.

Reduce it to the correct concentration but add the final butter relatively close to service.

The gnocchi can be shaped several hours ahead and held refrigerated on semolina dusted trays.

Do not stack them.

Portion approximately 7 to 9 gnocchi and three scallops per guest.

Keep the scallops refrigerated on absorbent paper.

When an order is fired, gently reheat the bisque.

Place the gnocchi into boiling water.

Begin searing the scallops shortly afterward.

Transfer the cooked gnocchi directly into a sauté pan with a small amount of bisque.

Glaze gently.

Finish the scallops.

Plate immediately.

The tarragon should touch the dish only during final plating.

Chef’s Technical Notes

Bake the potatoes rather than boiling them whenever possible. Lower moisture means less flour.

Rice the potatoes while hot. This produces a lighter texture.

Never use a food processor for gnocchi potatoes. It can create a gluey mass.

Treat the flour measurement as approximate. Potato moisture changes from batch to batch.

Do not knead aggressively. Minimal handling produces lighter gnocchi.

Roast the shellfish shells properly. This is where the foundation of the bisque begins.

Cook the tomato paste. Raw tomato paste produces a completely different flavor.

Reduce the alcohol properly. Cognac and wine should contribute complexity, not raw alcoholic heat.

Do not over extract the shells. Longer is not automatically better.

Use cream carefully. The sauce should taste of shellfish first.

Dry the scallops thoroughly. Proper caramelization requires a dry surface.

Use tarragon with restraint. Its aromatic intensity can easily dominate delicate seafood.

Wine Pairing

Etna Bianco DOC

An Etna Bianco based primarily on Carricante is an excellent first choice.

Its mineral character and high natural acidity provide a strong contrast with the concentrated shellfish bisque while remaining elegant enough for the scallops.

Vermentino di Gallura DOCG

Vermentino provides Mediterranean salinity and freshness that connect naturally with the shellfish and scallops.

Fiano di Avellino DOCG

Fiano has enough structure for the bisque and potato gnocchi while maintaining sufficient acidity to keep the pairing balanced.

Franciacorta Brut DOCG

Fine bubbles and acidity cleanse the palate after the creamy bisque and create an elegant contrast with the soft gnocchi.

Chef Gianluca’s Recommendation

There are two places where this dish can easily become heavy: the gnocchi and the bisque.

So attack those problems from the beginning.

Bake the potatoes so they remain dry.

Use only enough flour to create a dough that holds together.

Handle it as little as possible.

Then build the bisque through the shells, vegetables, tomato paste, Cognac, wine, and reduction.

Do not try to manufacture intensity with excessive cream.

Finally, cook the scallops simply and correctly.

Three naturally caramelized scallops, several exceptionally light purple gnocchi, enough bisque to connect everything, and just a few leaves of fresh tarragon.

The first bite should give you concentrated shellfish.

Then the soft potato gnocchi.

Then the sweetness and caramelization of the scallop.

The tarragon should appear only at the end as a clean aromatic finish.

That is the balance this dish needs.

Recipe Information

Servings: 4. Prep Time: about 30 minutes. Cook Time: about 25 minutes. Total Time: about 55 minutes.

Wine Pairing

Vermentino: saline freshness and citrus lift work naturally with seafood. Verdicchio dei Castelli di Jesi: firm acidity and almond notes complement fish and shellfish. Ribolla Gialla: mineral freshness keeps the palate clean. Falanghina: floral and citrus character works with olive oil, herbs, and delicate sauces. Etna Bianco: volcanic minerality and acidity suit more structured seafood dishes.

Nutrition per Serving

Approximate nutrition per serving: 460 calories, 1.2 oz protein, 0.99 oz carbohydrates, 0.78 oz fat, 0.18 oz saturated fat, 0.14 oz fiber, 0.18 oz sugars, 720 mg sodium, and 105 mg cholesterol. Values vary with the fish, sauce, and portion size.

Storage and Reheating

Cool leftovers promptly and refrigerate in an airtight container for up to 3 days. Reheat gently with a small amount of stock, water, or sauce as appropriate. Avoid repeated reheating because it damages texture and can dry proteins or overcook starches.

Chef Gianluca