Seafood Spaghetti

Ingredients

• 1 lb. cooked shrimp or minced clams
• 1 c. onion, finely chopped
• 1/4 c. margarine
• 1 (16 oz.) can tomatoes, chopped
• 1 (8 oz.) can tomato sauce
• 1 (4 oz.) can mushroom stems & pieces, drained
• 1 tsp. garlic salt
• 1/2 tsp. oregano
• 1 lb. spaghetti
• Parmesan cheese