You need 1 ingredient. The key ingredients include: ["Seafood Tart in a Crispy Potato Crust with Jalapeno Salsa", "Crust", "4 1/2 cups frozen, shredded hash brown potatoes, thawed", "1/4 cup Gruyere cheese, crumbled", "2 large eggs, beaten to blend", "1 teaspoon salt, or to taste", "1/2 teaspoon freshly ground black pepper, or to taste", "1 Tablespoon fresh tarragon, finely chopped (or 1 teaspoon dried)", "Filling", "2 Tablespoons extra virgin olive oil", "1/2 cup cremini mushrooms, sliced", "1 clove garlic, peeled and finely chopped", "1 small jalapeno chili (stemmed, seeded and finely chopped)", "1/2 cup cooked lobster meat, shelled and finely chopped", "1/2 cup cooked crabmeat, shelled and finely chopped", "1/2 cup cooked shrimp, shelled and finely chopped", "1/2 cup Gruyere cheese, crumbled", "3/4 cup heavy cream", "2 large eggs, beaten to blend", "1 tablespoon fresh tarragon, finely chopped (or 1 teaspoon dried)", "Salsa", "1/2 cup heavy cream", "1 cup sour cream", "2 Tablespoons fresh lemon juice", "1/4 cup cucumber (peeled, seeded and finely chopped", "1/2 teaspoon jalapeno chili, seeded and finely chopped", "1/8 teaspoon cayenne pepper (optional)", "1 Tablespoon fresh tarragon, finely chopped (or 1 teaspoon dried)"].