Rhubarb is not a fruit at all, but a vegetable and belongs to the knotweed family. It is mostly used for sweet treats, such as a rhubarb pie from the tray.
The recipe for a classic Rhubarb meringue cake is available at Einfach Tasty. The preparation is very simple: clean and wash the rhubarbs and cut into pieces. For the batter: Beat butter, sugar, vanilla sugar and salt with a hand mixer until fluffy. A total of 800 g of rhubars are needed for the cake.