Quorn was grown from a fungus found in soil. Yummy yumm yumm. It has to be treated to remove toxins. Yumm. Tastes a bit shiite too. And I speak as somone who does not eat meat (but I eat fish). I recommend you search out dried tofu, not the very dry stuff, but the kind that is eateable raw. I love it. It is the brown squares in the first photo:
http://yireservation.com/recipes/dried-bean-curd-with-celery/
The spiced version is nice raw, and also sliced and used in stir fries and noodle soup. You can also buy a totally dry form that has to be soaked, and can be nice if cooked in a spicy sauce. Far better than that Quorn stuff, which is a bit rank to my tastes.