Preheat the oven to 170°C | 150°C fan | 325°F | Gas mark 3
Line 2 baking trays with baking paper.
TOP TIP: to achieve the best whipped aquafaba, clean your bowl with lemon juice or white vinegar, simply add a few drops and give the bowl a wipe around with a clean paper towel.
In a clean mixing bowl, whisk up the aquafaba and cream of tartar. This can take 5-10 minutes to get the right consistency, you need your aquafaba to turn from a yellow tinge to white.
Add the caster sugar one spoon at a time whilst still whisking until the meringue base is lovely and glossy.
Next add the ground almonds, amaretto (if using) and almond extract and fold until fully combined. You'll end up with a sticky mess. Don't worry if it looks like all the air has been knocked out, this is normal.
Scoop dessert spoons of the mixture and drop them into a bowl of icing sugar. Once covered, your amaretti dough will be easier to handle and roll into a ball.
This is enough mixture to make 20 balls the size of walnuts. Place 10 on each tray, they don't spread much, and place in the oven for 20 mins.
Remove from oven once slightly golden and puffed up with familiar cracks. Place on a cooling rack and leave to cool completely before removing, they are still fragile when warm.