For the Rhubarb Cheesecake with Toffee Sauce, first melt the granulated sugar in a small saucepan for the toffee sauce and caramelize. Pour in the cream and simmer, stirring, until the sugar has dissolved. Set aside.
Peel rhubarb and cut into pieces about 1 cm thick. Mix with 50 g granulated sugar and let steep for about 10 minutes. Drain well over a sieve, collecting liquid.
Melt the butter slowly and mix into the finely crushed butter cookies. Line a baking pan with parchment paper and spread the butter cookies in the pan and press down well. Spread rhubarb pieces on top.
Mix rhubarb liquid with cream cheese, curd cheese, remaining granulated sugar, vanilla sugar cornstarch, eggs and salt until well blended. Pour into the mold, smooth out and bake in a preheated oven at 160 °C convection oven for about 50 minutes.
Allow to cool in the mold and then portion.
Place on plates and serve rhubarb cheesecake garnished with toffee sauce.