Mix the sugar with the yolk until very creamy, then stir in the oil, gently stir in the lemon peel and flour + starch, finally fold in the egg whites - spread the dough into a prepared (approx. Bake for 15 minutes - leave to cool.
For the topping, soak the gelatine in cold water, whip the cream until stiff, stir the curd cheese with sugar and lemon juice + zest well, add 3 tablespoon. Heat and dissolve rum (do not boil) and stir into the curd mixture, now fold in the whipped cream - spread the curd mixture on the cold cake - chill for about 1 hour.
Then put the berries on top - prepare the cake jelly according to the instructions, stir in the sugar and rum, let cool a little and then pour over the berries - put in a cool place.