Orange Roughy with Indian-Spiced Tomato Sauce

Name: Orange Roughy with Indian-Spiced Tomato Sauce
Yield: 4 Servings
Ingredients: 4 6-ounce orange roughy fillets or red snapper fillets (each about 1/2 to 3/4 inch thick); 3 teaspoons garam masala; 2 tablespoons (1/4 stick) butter; 1 14 1/2-ounce can diced tomatoes with mild green chilies, undrained; 4 tablespoons chopped fresh cilantro; 1/2 cup plain yogurt