Wash the lemon
and grate the peel. Blanch the almonds for 2 minutes in boiling water
and take off the brown peels. Grind the almonds with the sugar in a
food processor. Add the egg white and the lemon peel and mix for half
a minute more. In the fridge, you can keep this for months. Just before
use, add an egg yolk.
If you grind the almonds very fine with powdered
sugar and a little rose water, you will get marzipan. It is however
difficult to do that at home.