UPB and I eat tofu or quorn with pretty much every evening meal. As I am not the chef of the household I'm sure his input will be of more use to you, but I cannot stress enough how versatile the two products are. Tofu is trickier to get right than quorn, but using chunks of it as the meat alternative in spaghetti bolognese for example, is wonderful. You have to buy the non-silken blocks of tofu, freeze them, then defrost in boiling water or a microwave, thoroughly drain them, cut them into small cubes and add to your sauce of choice. Because the freezing will have changed the texture of the tofu, the sauce really soaks in. I leave the tofu simmering in the sauce for a few minutes just to thoroughly infuse it.
I also like to add capers, black olives and chunky sauteed garlic to the tomato sauce.
Good times.