Put the almonds paste in a bowl, add the lemon zest, the sugar and egg whites. Mix until the egg whites dilute the sugar and the mixture becomes a paste.
Take a lump of paste and roll it into a ball about 1" in diameter.
Put the ball on a baking sheet lined with baking paper and press it down with the palm of your hand to flatten it.
Top with pignoli nuts.
Make all your cookies and bake for 20 minutes.
Let the cookies cool before you remove them from the baking paper.
