Baked Gefilte Fish

Name: Baked Gefilte Fish
Ingredients: 1 1/2 pounds rockfish fillet; 1/2 pound pike fillet; 1/2 pound flounder fillet; 8 cups fish stock, preferably homemade; 3/4 cup matzo meal; 4 large eggs, lightly beaten; 2 tablespoons sugar; 1 tablespoon chopped fresh thyme leaves; 2 tablespoons chopped fresh parsley; 1 teaspoon freshly grated lemon zest; 2 1/2 teaspoons salt; 1/8 teaspoon freshly ground black pepper; Boiled Carrots with Prepared Horseradish for serving; Vegetable stock or water can be used instead of fish stock.