Add sugar to the soft margarine (butter) and beat thoroughly with a mixer. Grate the lemon zest on a fine grater and set aside 1 tablespoon of zest to seal, add the rest of the zest to the oil mixture. Squeeze the juice out of the lemons (I used a juicer), you should get at least 80 ml of juice, 60 of which add to the oil mixture with eggs, and beat again with a mixer.