Clean, wash and cut the rhubarb into pieces. Bring to the boil in a saucepan with 5 tbsp. water and simmer covered for about 5 minutes. Stir pudding powder and 2-3 tbsp. cold water until smooth. Stir into the rhubarb and bring to the boil again briefly. Season to taste with 2-3 tbsp. sugar. Let it cool down
Mix quark, yoghurt, liqueur and 2 tablespoons of sugar until smooth. Coarsely chop the pastry and place it on the rim of the dessert glasses or bowls. Pour in half the quark cream. Spread rhubarb on top. Spread the rest of the cream on top. Chill for at least 1 hour
Wash, clean and halve fresh strawberries (defrost frozen strawberries). Spread on the cream