Soak gelatine in cold water, 2 minutes for granulated gelatine, 15 minutes for strip gelatine. Steep the grated lemon rind in the boiling water a few minutes for flavor. Add to the softened gelatine and stir until dissolved. Strain through cheese cloth, add sugar and when cool add the lemon juice.
Pour into any desired mould to harden, several hours or over night. Chill and serve. Reser