Step 1

Preheat the oven to 350 degrees Fahrenheit.

Step 2

Use a spice grinder or food processor to grind the pistachios into a fine flour.

Step 3

In a bowl, combine the pistachio flour with the almond flour. Add sugar, eggs, and lemon zest. Mix to combine.

Step 4

Break cookie dough into pieces a little bigger than a walnut shell. Coat hands in powdered sugar and rub on the outside of the cookie dough ball until the dough is covered in powdered sugar.

Step 5

Place on an ungreased cookie sheet, leaving indents with your fingers on the dough.

Step 6

Bake for about 15 minutes. The dough should still be soft, like marzipan. Bake for 18-22 minutes for a crunchier cookie.