01 -
Set your oven to 225°F (110°C) and put parchment paper on a baking tray.
02 -
Take a spotless bowl and whip egg whites until they foam up. Throw in a tiny bit of salt and keep beating until you see soft peaks.
03 -
Slowly pour in sugar while beating, one spoon at a time, until the mix gets shiny and forms stiff peaks.
04 -
Softly mix the cornstarch and vinegar in, making sure everything blends well.
05 -
Gently fold in both lemon peel and juice. Don't push down the fluffy mixture too much.
06 -
Get a piping bag with star tip and squeeze small mounds onto your lined tray, leaving space between each one.
07 -
Put the tray in your hot oven and bake for about an hour. They're done when they feel dry and lift off easily from the paper.
08 -
Switch off the oven but keep cookies inside to cool down slowly for at least half an hour.
09 -
If you want, sprinkle some powdered sugar on top to make them prettier and sweeter.