Seaside Shrimp Casserole
["1 lb. fish (such as cod or sole)", "1 Tbsp. butter or margarine", "1 medium onion, thinly sliced", "2 cloves garlic or equivalent garlic powder", "salt and pepper to taste", "lemon juice to taste", "1 c. sour cream", "1 Tbsp. Dijon-style mustard", "1 1/2 c. cooked shrimp, shelled and deveined", "dill or parsley, chopped"]
["Clean fish and wipe off excess water.", "Cut into serving pieces or cubes; set aside.", "Saute onion in butter until soft but not browned.", "Add garlic and fish to onions; heat to simmer.", "Cook for 10 to 20 minutes until fish is just tender and flakes easily. Don't overcook.", "Add salt and pepper.", "Sprinkle with lemon juice; set aside."]
["fish", "butter", "onion", "garlic", "salt", "lemon juice", "sour cream", "mustard", "shrimp", "dill"]