Peel the skin off the rhubarb and cut into 1 1 / 2-2 cm pieces. Peel and core the apple and cut into wedges. Then put both in a saucepan, add water so that it is covered. Add the lemon juice, sugar and vanilla sugar. Bring the rhubarb to the boil briefly and thicken slightly with the moon amine / light.
Add the elderflower syrup or the elderflower and let cool slightly. Add the washed and chopped strawberries.