Lemon Curd

Directions

1. 1
   Combine the yolks, sugar, and lemon zest and juice in a medium heavy-bottomed saucepan.
2. 2
   Cook over medium-low heat, stirring constantly with a wooden spoon, until the mixture is thick enough to coat the back of the spoon, 8 to 10 minutes.
3. 3
   Pass the mixture through a fine sieve into a medium bowl.
4. 4
   Add the butter, 1 piece at a time, stirring after each addition, until the butter is melted and combined.
5. 5
   Cover with plastic wrap, pressing directly onto the surface of the lemon curd to prevent a skin from forming.
6. 6
   Refrigerate until firm and thoroughly chilled, at least 1 hour.