Lemon Curd

Directions

1. 1
   Whisk together yolks, zest, juice, sugar, and salt in a heavy saucepan.
2. 2
   Bring to a simmer over medium heat, whisking constantly.
3. 3
   Cook until thickened, 8 to 10 minutes.
4. 4
   Strain through a fine sieve into a bowl.
5. 5
   Whisk in butter, one piece at a time, until smooth.
6. 6
   Press plastic wrap directly onto surface, and refrigerate until cold, 1 hour or up to 1 day.