1 cup citrus juice or berry/fruit puree
Zest of 2 citrus fruit, if applicable
1 cup sugar
6 large eggs
12 tablespoons (1 1/2 sticks) unsalted butter, cut into bits
Try making curd with any citrus fruit, like limes, oranges, grapefruit, tangerines, etc. You can also make curd with purees of berries such as raspberries or blackberries.