Shrimp Sauce - Rejesauce

Cut large shrimps in half.

Melt half of the butter over low heat, stir flour into it and mix until smooth. Add the milk a little at a time, stirring well. Add the rest of the butter, sour cream, sugar, shrimps and salt to taste. Boil for about 2 minutes. Add sherry and remove from heat. Serve hot over fish fillets or steaks.