Banana Cream Filling

1 Cup Milk
1/2 Cup Sugar
3 Tablespoons Flour
1/8 Teaspoon Salt
2 Egg Yolks -- slightly beaten
1 Large Banana -- mashed
2 Tablespoons Lemon juice

Heat the milk in a heavy-bottomed pan until very hot but not boiling.
Mix the sugar, flour, and salt together in a bowl, stir in the hot
milk, and beat until well blended. Pour back into the pan and
continue stirring vigorously over low heat for 4-5 minutes, until very
thick and smooth. Add the egg yolks and cook for a few more minutes.
Cool.

Mash the banana and beat it until smooth, add the lemon juice and stir
the mixture into the cooled filling.