Prepare a dough from butter to cornstarch, grease the springform pan, pour in the dough, put pieces of rhubarb on top. Bake at 175 degrees for 25 minutes.
Prepare the meringue, place on the cake and bake for another 20 minutes.
Danger! always make sure that the meringue doesn`t get too dark, maybe switch it down a bit.
Then let stand in the warm oven for 5-10 minutes. Have fun baking!