Incredibly Rich Lemon Curs Recipe

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. Whisk in the egg yolks, 1 at a time, and cook over moderately high heat, whisking constantly, until the curd is the consistency of loose sour cream, about 15 minutes. strain the curd into a bowl and press a piece of plastic wrap directly onto the surface to prevent a skin from forming. Refrigerate before serving.