Irma Rombauer's instructions for 'Orange Filling' (aka custard, but not really, since her actual orange custard recipe comes later and includes sectioning whole oranges) are as follows: Stir and cook in a double boiler until thick: 1/2 tsp grated orange rind 1 tbsp lemon juice 6 … [Read more...] about Orange Custard from the 1948 Joy of Cooking (aka “6 Egg Yolks Later”)