METHOD
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preparation
Preheat your oven to 150 °C / 300 °F. Place the rack in the middle of the oven. Line a baking sheet with parchment paper.
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dry and wet ingredients
Add powdered sugar to a large bowl. Save about a tablespoon of powdered sugar for egg whites. Add almond flour and salt, and stir to combine. Beat the egg whites with a tablespoon of powdered sugar and freshly grated lemon zest in a smaller bowl. Use a hand whisk or an electric mixer and whisk until soft peaks form (the mixture should be foamy and light).
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shape the cookies
Add the egg white mixture to the almond mixture. Using a spatula, stir to form a cookie dough. Cut the dough in half, and shape each half into a long rope 3 cm (1-inch) in diameter. Cut rope into small pieces 1 cm (1/2-inch) in diameter. Place each cookie on a prepared baking sheet. Using your hand, gently push down.
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bake
Don't overcrowd the cookies on the baking sheet. Generously sprinkle with powdered sugar. Place in the preheated oven and bake for 18 - 20 minutes at 150 °C / 300 °F or until the cookies are golden-brown and the exterior cracks slightly. Remove from the oven and leave to cool completely, then transfer to a cookie jar.