Amaretti biscuits

Amaretti biscuits (makes about 48):

Pre heat oven to gas mark 2
Line a tray with foil, butter and flour it
Combine 300g whole toasted almond, 250gr sugar, 25 gr plain flour, ¼ tsp salt in the food processor.
Process to a crumbly powder
Transfer to a bowl, stir in 4 egg whites and 2 tsp almond extract
Bake for 20mins or until dry