Boil a sugar syrup with gelatin, beat until spongy, set in a pan, and roll in icing sugar.

Steps

1. Soak gelatin.
2. Put sugar, 1 cup water and cream of tartar in a saucepan and boil until syrup spins a thread from the lip of a spoon.
3. Add soaked gelatin.
4. Add egg white. Beat at high speed until mixture is white and spongy and beginning to set.
5. Pour into a pan which has been rinsed with cold water. Stand until quite firm and set.
6. Cut in squares and roll in confectioner’s sugar (icing sugar).