Chilean Salmon Ceviche

Name: Chilean Salmon Ceviche
Ingredients: 2 cups lobster stock; 2 cups clam juice; 1/4 cup orange juice; 1/4 cup lime juice; 1/2 teaspoon dry mustard; 1/8 cup mayonnaise; 1/2 cup heavy cream; 2 tablespoons grain mustard; 1/4 tablespoon aji amarillo; 2 (6-ounce) Chilean salmon fillets, cut into very thin slices; 1 yellow tomato, diced; 1/2 bunch scallions, sliced; 1/2 bunch cilantro, leaves chopped; 1 bunch chives, chopped; 3 sweet potatoes, peeled, steamed and sliced to 1/4-inch pieces