Scald the clams in their own liquor. If opened by steaming, they are sufficiently cooked. Chop them into fine dice and measure. To each cupful of chopped clams add one cupful of thick cream sauce. For one cupful of sauce put into a saucepan one tablespoonful of butter; when melted, stir in one tablespoonful of flour; cook, but not brown it; then add slowly one half cupful of clam liquor and one half cupful of milk or cream; season with pepper, and salt if necessary. Let it cook until a smooth, thick cream, stirring all the time; add the clams only just before serving. Pour the mixture over small pieces of toast laid on the bottom of the dish.