Lemon Curd

Directions

1. 1
   Whisk eggs, sugar, and lemon juice in a double boiler over simmering water until mixed well, then continue to stir until thick, 7 to 10 minutes.
2. 2
   Drain through a mesh sieve to get rid of lumps.
3. 3
   Fold in butter until well incorporated.
4. 4
   Mix in lemon zest.
5. 5
   Cover curd and chill in the refrigerator until it has thickened, about 4 hours.