Mix the sauce ingredients with the mixer or hand blender and set aside. Process the smoked tofu with the lightning chopper or a fork. Cut the leek into thin slices.
First fry the potato noodles in a large pan and set aside. Then fry the mince until crispy. Add the leek and marjoram and season to taste with salt and pepper. Fry everything together for another 3 - 5 minutes, then add the sauce and bring to the boil until it thickens. Finally fold in the potato noodles, transfer everything to a baking dish and bake at 180 degrees for about 20 - 30 minutes, until the casserole turns brown on top.
Tip: If you can`t get vegan potato noodles and don`t want to make one yourself, use gnocchi instead, because they are also made from potato dough.