Cut the vanilla pod lengthwise. Scrape out the vanilla pulp with the back of a knife
Bring milk, 3-4 tablespoons of water, vanilla pod, vanilla pulp, lemon zest and salt to the boil while stirring. Add rice. Cover and let it swell for about 20 minutes at low heat. Remove lemon peel. Let the rice cool down
Wash the apple and cut into pieces or thin slices as desired. Stir the quark into the rice and season with sweetener
Pour about 3/4 of the apple and rice pudding into a bowl. Arrange the remaining apple on top. Sprinkle a little cinnamon on top and decorate with lemon balm if desired