Sieve the icing sugar into a bowl. Add almonds, egg white and baking oil. Mix everything well. Line 2 baking trays with baking paper. Form approx. 50 walnut-sized balls from the mixture with moistened hands and spread on the baking trays. Press the upper part of the balls with 3 fingers.
Leave the Amaretti to rest in a cool place for a few hours, preferably overnight. Then bake one after the other in a preheated oven, lowest shelf (electric oven: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 20 minutes. Let the Amaretti cool down on the trays. Then carefully loosen and dust with icing sugar. They keep in tins in a cool and dry place for about 14 days. Serve amaretti with ice cream, mixed berries and cream, for example
Waiting time approx. 12 hours