Stella14 is correct, the proper Quorn products are very good. I had a veggie friend from the US come to stay and I made cottage pies, pasta bolognaise, chilli con carne, etc with it and I liked it, too. But do ask as some people who go veggie may not want the traditional dishes any longer.
Veggie stir frys are good, too. I just added the chicken or prawns to our share. Cashews are a good filler in a stir fry.
Open topped omelettes/frittatas chock full of veggies and topped with grated cheese or Philly Cream cheese blobs then flashed in the oven to puff up are tasty, too. Less stodgy than a quiche for me. We try to have one or two meatless dinners a week, the other days are fish or chicken. Only one day of pork or red meat.