Vegetarian recipe ideas
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Heat the oven to 150C/fan 130C/gas 2. Heat an ovenproof casserole. Make incisions all over the beef with a small, sharp knife and push in the slivers of garlic. Rub the topside all over with oil then season well.
Put in the pan and brown on all sides, until it has a really deep colour. Spend a bit of time doing this, as it will all help the flavour of the gravy. Lift out of the pan and add the onions with a pinch of salt. Cook on a fairly high heat until the onions have started to break down and turn golden. Add the beer and bring to a simmer. Add back the beef with the bay and peppercorns and cover with a lid. Transfer to the oven for 3 hours.
Take the beef from the gravy, trim away any fat or other straggly bits, cool to room temperature and chill for 2 hours (this will make it easier to slice, see note). Once chilled, slice the beef as thinly as possible. Strain and warm the gravy, before serving.
Warm the rolls in a low oven, then split and spread thinly with mustard. Drop the beef into the gravy for a few minutes to reheat then stuff it into the baguettes along with a few slices of cheese. Serve the rest of the gravy on the side in bowls for dipping.