Put a large middle cut of salmon into a saucepan, with a sliced carrot, a large onion, a bunch of parsley, salt and pepper to season, half a cupful of butter, two cupfuls of Claret, and enough stock to cover. Cover with buttered paper and cook slowly for an hour. Take up the fish carefully and keep warm. Strain the liquid, skim the fat, and thicken with butter and flour cooked together until brown. Add a tablespoonful of butter, seasoned with lemon-juice and anchovy essence, pour over the fish, and serve.