Authentic Lady B custard powder. What is custard powder? What is in Custard Powder? Why is Custard Powder for? Custard powder is a powdered mix primarily made of cornflour, sugar, flavoring, and coloring. When mixed with milk and heated, it thickens to create a creamy dessert similar to custard for making Africa’s favorite breakfast dish. This is a quick and easy way to make traditional European and African custard porridge and dishes. Standard Recipes of custard powder: You mix 2 tablespoons of powder with some sugar and milk and mix to a paste. Then add 1 pint of nearly boiling milk, and heat gently to the boil. Serve over your favorite pudding. The original flavor custard has the true traditional taste. Authentic Lady B custard powder has no substitute.