Salmon Chowder

Name: Salmon Chowder
Ingredients: 1 pound salmon filet; 2 tablespoons unsalted butter; 1 yellow onion; 1 garlic clove, minced; 1 carrot, diced; 1 celery rib, diced; 2 russet potatoes, peeled and diced; 5 cups seafood stock, chicken stock, or water; 1/2 teaspoon dried thyme; 2 tablespoons chopped dill; 2 tablespoons tomato paste; 1/4 cup chopped parsley; 1 tablespoon capers; 1/2 cup sour cream; salt and pepper to taste