Citrus Flounder

1-1/2 lb. flounder fillets
Salt and pepper to taste
1 med. onion, chopped
5 tbsp. chopped parsley
4 tsp. Oil
2 tsp. grated lemon rind
2 tsp. grated orange rind
Orange and lemon slices

Butter crockpot -salt and pepper on fish to taste. 
Place fish in crockpot. Put onion, parsley and grated rinds and oil over fish. 
Cover and cook on low for 1 1/2 hours -2 hours
Serve garnished with orange and lemon slices.