Cut the leek into rings, cut the potatoes into small cubes.
Mix the leek in a pan with the potato cubes, the pureed silken tofu, cheese substitute, soy cream and spices to a creamy mixture. If necessary reduce it a little, otherwise the contents of the quiche will be very runny.
Grease the quiche or casserole dish, line with the puff pastry and pour in the hot filling from the pan. You can choose to make a lid out of puff pastry or add gratin cheese on top (attention! Always mix Wilmersburger with water or soy cream, otherwise it won`t melt!).
Bake in the oven for around 30-35 minutes at 180 degrees fan-assisted or bottom heat. Top heat is unfavorable if you make the quiche with a lid.