Sauce For Salmon And Other Fish

One cupful of milk heated to a boil and thickened with a tablespoonful of cornstarch previously wet up with cold
water, the liquor from the salmon, one great spoonful of butter, one raw egg beaten light, the juice of half a lemon,
mace and cayenne pepper to taste. Add the egg to thickened milk when you have stirred in the butter and liquor; take
from the fire, season and let it stand in hot water three minutes, covered. Lastly put in lemon juice and turn out
immediately. Pour it all over and around the salmon.