Incredibly Rich Lemon Curd

Directions

1. 1
   In a medium bowl set over a saucepan of simmering water, melt the butter with the lemon juice and sugar, stirring occasionally, until the sugar is dissolved.
2. 2
   Whisk in the egg yolks, 1 at a time, and cook over moderately high heat, whisking constantly, until the curd is very hot to the touch and the consistency of loose sour cream, about 15 minutes.
3. 3
   Strain the curd into a bowl and press a piece of plastic wrap directly onto the surface to prevent a skin from forming.
4. 4
   Refrigerate before serving.