Rhubarb rinse, cut into small pieces, sugar, strain on a sieve (steaming insert).
Sugar, eggs, vanilla sugar with mixer until creamy thick. Now lightly fold in nut + cornstarch. Part of this amount under rhubarb, rest on top.
Pre-bake the base at 200 °C for 12-15 minutes. Bake later with rhubarb for another 30-35 min.