3 tbsp cornstarch
1/2 cp cold water
1 egg, slightly beaten
1/2 cp sugar
1/4 tsp salt
grated rind and juice 1 lemon
1 1/2 cps boiling water
1 - Mix the cornstarch to a smooth paste with the cold water.
2 - Combine the egg, sugar, salt and lemon rind and juice.
3 - Add to the cornstarch and gradually stir in the boiling water.
4 - Cook and stir over a slow flame until the mixture thickens like jelly.
5 - Cool slightly; and spread between the layers of cake.