Spicy Shrimp Bisque

Name: Spicy Shrimp Bisque
Ingredients: 3 tablespoons unsalted butter; 1 yellow onion, thinly sliced; 1 medium carrot, thinly sliced; 2 large cloves garlic, peeled and thinly sliced; 2 pounds raw shrimp, shelled and deveined,reserve shells; 3 plum tomatoes, coarsely chopped; 3 tomatillos, coarsely chopped; 1-2 chipotles en adobo, with added sauce, minced; 4 cups fish stock, prepared clam broth or chicken broth; 1/2 cup fine fresh bread crumbs; 1/2 cup heavy cream; 2 tablespoons dry sherry, optional; Salt and pepper, to taste; 1 pinch cayenne pepper