Kosher Salt in a natural culinary setting. The Essential Difference Kosher salt has large easy-to-handle crystals and is useful for controlled seasoning in professional kitchens. The key to using kosher salt well is understanding what it contributes to structure, flavor and technique rather than treating it as a generic pantry item. What Is Kosher Salt? Kosher Salt should be understood by its composition, processing and culinary behavior. Those factors determine how it reacts