I'm not sure what a quorn roast is to be honest :s
As for the sauce though look in the recipes thread there is a syn free bbq sauce that's pretty good, don't think there is anything you can buy that is syn free tho.
Quorn roast is 4.5 syns per quater of roast, really suprising I know because it doesnt have any coating or anything, but it is lovely.My tip is when cooking it under cook rather than overcook, has a tendency to really go dry.
We frequently use Quorn chicken pieces or fillets, which are great if we're in a rush 'cos you don't need to defrost either of them! We just bung them into a casserole dish, add a carton of chopped tomatoes with onion, or chilli or basil, which are syn free, and cost around 55p from Supermarkets, and heat for around 6-7 mins, following the instructions on the pack. The juice from the tomatoes makes ideal 'gravy' for your veg! Beware, the cartons with olives DO have syns, but are also good over pasta!
You can, of course, make your own syn free sauce, but I find that, when confronted with a list of more than 2 or 3 ingredients my eyes seem to glaze over and I rapidly go off the idea...
Perhaps I should start a thread called "Sluts Corner" or something, for very easy meals or recipes, especially ones that just use the microwave!!!