Instructions

  1. Finely grate enough zest from lemons to measure 2 teaspoons and squeeze enough juice to measure 1/2 cup.
  2. In a metal bowl whisk together zest, juice, sugar, and eggs.
  3. Cut butter into 4 pieces and add to mixture.
  4. Set bowl over a saucepan of simmering water and cook mixture, whisking occasionally, until thickened and smooth, about 20 minutes.
  5. Lemon curd may be kept, chilled and its surface covered with plastic wrap, 3 days.
  6. Serve lemon curd warm or chilled.