3/4 cup sugar
1/3 cup flour
Dash salt
2 cups milk
3 eggs yolk large, lightly beaten
2 lemons large
In a medium saucepan, mix sugar, flour and salt. Stir in milk. Stirring over medium heat, bring to a boil and boil for 8 to 10 minutes or until very thick and glossy.
Gradually stir about one-third of the hot mixture into egg yolks, then stir back into hot mixture in saucepan. Cook and stir over low heat 2 minutes longer (do not boil). Remove from heat.
Grate lemon rind to make 1 tablespoon; set aside. Squeeze lemons to make 1/2 cup juice. Stir lemon rind and juice into cooked mixture. Chill at least 1 hour. Stir before using as a filling for cream puffs.