Corn Chowder with Jalapeno Cream

Name: Corn Chowder with Jalapeno Cream
Ingredients: 3 cups of chicken stock; 1 cup dry white wine; 1 garlic clove; 2 sprigs fresh thyme; 3 pounds (about 6 dozen) littleneck clams in the shell, scrubbed clean; 4 tablespoons (2 ounces) unsalted butter; 1 cup diced onion; 1/2 cup diced leek, white part only; 1/2 cup diced carrot; 1/4 cup diced celery; 6 or 7 ears fresh sweet corn, shucked, kernels removed, reserving cobs; 1 1/2 cups heavy cream; Salt; Freshly ground white pepper; Juice of 1/2 small lemon; Jalapeno Cream:; 1/2 cup heavy cream, whipped; 1/4 cup sour cream; 1 jalapeno pepper, cored, seeded, and minced; 2 tablespoons chopped cilantro; Lemon juice