What is curd? Sweet curd is made with 4 main ingredients. 3 of which are always butter, sugar, and eggs. The 4th ingredient is normally a tart or citrus flavour. Once made properly it sets to a dropping consistency. This is because both the butter and the egg yolks play a part in the setting process. You’ve probably heard of lemon curd. It is extremely easy to make – in fact, if you want to see me make it, plus get the recipe you can head on over to my lemon curd recipe by clicking the image below.