Wash the lemon thoroughly and rub dry. Finely grate the peel, then squeeze one half of the lemon. Bring the milk, poppy seeds, vanilla sugar, 2 tablespoons of sugar and lemon zest to the boil and allow to swell at low heat for 10-15 minutes while stirring. Let the poppy seed mixture cool down.
Mix the low-fat curd, buttermilk, remaining sugar and lemon juice. Stir the cream quark into the poppy seed mixture. Layer the poppy seed quark, buttermilk quark and berries in a bowl. Decorate as desired with 2 fresh cherries