Lobster Veloute with Chilled Lobster Salad and Caviar

Name: Lobster Veloute with Chilled Lobster Salad and Caviar
Ingredients: 1 cup cognac; 2 pounds onion, diced; 1 pound carrot, diced; 1 pound celery, diced; 8 lobster carcasses; 6 leeks, washed and diced; 2 bulbs fennel, diced; 2 quarts heavy cream; 2 pounds cooked lobster meat, cut into bite-size pieces; 1 cup creme fraiche; 2 tablespoons chopped fresh chives; 2 tablespoons chopped fresh parsley; 2 tablespoons chopped fresh tarragon; 2 lemons, zested and juiced; 2 1/2 tablespoons black caviar, for garnish