2 Tb. corn starch
1/3 c. sugar
1/2 c. boiling water
1 Tb. butter
1 lemon
1 egg
Mix the corn starch and sugar, and add to this the boiling water. Put to
cook in a double boiler, add the butter, the grated rind of the lemon,
and cook for 15 or 20 minutes. Beat the egg slowly, add to the mixture,
and cook for 5 minutes more. Remove from the heat and add the juice of
the lemon. Cool and spread between layers of cake.