For the benefit of people like me, who don't know what Quorn is:
Quote Originally Posted by Wikipedia
Quorn is the leading brand of mycoprotein food product in the UK and Ireland. The mycoprotein used to produce Quorn is extracted from a fungus, Fusarium venenatum, which is grown in large fermentation vats.

Quorn is produced as both a cooking ingredient and a range of ready meals. It is sold (largely in Europe but also in other parts of the world) as a health food and an alternative to meat, especially for vegetarians, earning the Vegetarian Society's seal of approval. As it uses egg white as a binder, it is not a vegan food.
In looking at some pictures, it doesn't look very appetising. I did try vegetarianism briefly a year or so ago, maybe I wouldn't have suffered through it so much if I had this.