Heat butter or oil in a frying pan and brown the faggots on all sides for about 5-7 minutes. This will add flavor and help them hold their shape. Transfer the browned faggots to an ovenproof dish. In the same pan used to brown the faggots, melt butter, and whisk in the flour to make a roux. Gradually add the beef stock while whisking to avoid lumps. Season with salt and pepper. Pour the gravy over the faggots in the dish. Cover the dish with foil and bake for about 40-45 minutes, until the faggots are cooked through