Cold Salmon with Black Sesame Crust and Herb Mayonnaise

Name: Cold Salmon with Black Sesame Crust and Herb Mayonnaise
Ingredients: 10 ounces skinless salmon fillet; 2 ounces black sesame seeds; 1/2 cup mayonnaise; 2 teaspoons finely chopped watercress; 1 tablespoon finely chopped parsley; 1 small hard-boiled egg chopped; 1/2 teaspoon Dijon-style mustard; 1/2 teaspoon lemon juice; 1/2 teaspoon finely minced onion; 1/2 teaspoon finely chopped chives; 1 teaspoon finely chopped fresh tarragon; 1/2 teaspoon finely chopped capers; Olive oil; Sea salt; Freshly ground pepper; Pinch of cayenne pepper