Recipe: Lemon Curd

I just love lemons, from their gorgeous smooth yellow skin, to their versatility, I always make sure I've got some of these gorgeous yellow gems in my kitchen.
As promised here is the lemon curd recipe I use for cakes, tarts, whatever your heart may desire.
Lemon Curd
1 cup granulated sugar
3 eggs
1/2 cup lemon juice
1 tablespoon finely chopped lemon zest
1/4 cup butter

In top of a double boiler whisk sugar and eggs together. With a wooden spoon stir in the lemon juice and zest until well combined. 
Add butter and continue cooking until thickened around about 15-20 minutes.
Once thickened pour the curd into sterile jars and store in the refrigerator.
Enjoy!