Preheat the oven to 200C and line small brownie tin with parchment paper.
Bring rhubarb and strawberries to a simmer and cook for 15 minutes until everything is soft and mashable. Mix in the lemon juice and chia seeds and set aside.
Make the base by mixing together the ingredients to form a slightly sticky dough. Press into the tin, then bake for around 20 minutes until lightly golden.
Meanwhile prepare the filling by blending the silken Tofu, maple syrup (or dates) vanilla extract, cashew butter, custard powder and lemon juice and zest together in a blender until completely smooth.
Once the base is ready, remove it from the oven and spread the cheesecake filling evenly on top. Bake again for 20 minutes.
In a small bowl mix together all the ingredients for the crumble topping. Should it be very dry, add some plant milk, but be careful and make sure it does not become too moist.
Evenly distribute the strawberry and rhubarb „jam“ onto the cheesecake filling, then sprinkle the crumble on top and bake for another 15 minutes until the surface is golden.
Remove from the oven, let cool COMPLETELY before slicing up and Enjoy!