method
Mix the tongue with the onion-juice and the mayonnaise and spread it on thin slices of unbuttered bread.
Press the slices together and cut in two diagonally. Beat the egg, add the milk and dip the sandwiches in this mixture.
Brown them in a small amount of butter, first on one side and then on the other.
Garnish with parsley and serve at once on a hot platter.
