1 (6 oz.) can tuna or crabmeat
1 stick butter
2 tbsp. minced onion
1 pkg. Old English cheese slices
6 English muffins

Mix all ingredients together, except the cheese slices. Spread on muffins. Lay the cheese slices over the tuna or crab mixture. Put under broiler for approximately 5 minutes or until golden brown. Serve warm.