Lemon Curd for Macarons

Directions

1. 1
   Assemble the ingredients.
2. 2
   Bring the butter to room temperature.
3. 3
   Put the sugar and lemon zest in a bowl and rub together with your hands to mix.
4. 4
   Put the egg, lemon juice, and sugar in a heatproof bowl and mix.
5. 5
   Put on a double boiler and continue mixing with a whisk.
6. 6
   When it becomes just a bit softer than custard (about 83C), remove from the heat and continue mixing.
7. 7
   Keep mixing until it reaches about 60C (140F), then add the butter one tablespoon at a time.
8. 8
   Mix with an electric mixer as you go.
9. 9
   Keep mixing for about 5 more minutes, then you're done.
10. 10
    Transfer to an airtight container, wrap with plastic wrap, and let cool.
11. 11
    When cooled, store in the refrigerator overnight.
12. 12
    If using for a macaron filling, add the almond flour the next day, then fill the macarons.
13. 13
    Use it to fill lemon-flavored macarons!
14. 14
    Here's a recipe for Lemon Macarons..