Peel apples and ginger. Quarter apples, remove core. Cut apples into small pieces. Dice ginger finely. Place apples, ginger, sugar, apple and lemon juice in a pot and bring to the boil.
Let it boil down for about 10 minutes. Stir starch with a little cold water until smooth, stir into the apple compote and bring to the boil again. Let it cool down. Whip cream and vanilla sugar until stiff. Fold into the quark.
Divide the stewed apples and quark between four dessert glasses. Decorate with apple wedges, pistachios and lemon balm leaves.