Preheat the oven to 300⁰ F.
Season the beef with salt and pepper.
Place a Dutch Oven or an oven safe casserole dish on the stove and heat the olive oil over medium-high heat.
Working in batches so that you don’t stew the meat, brown the seasoned beef on all sides.
Add the mushrooms, shallots, garlic and herbs and cook, stirring, for 2–3 minutes.
Pour in the light beer to deglaze the pan, scraping up the bits from the bottom.
Whisk the xanthan gum into the beef stock.
Bring the stew to a boil and then add the stock and tomato paste.
Stir through to thoroughly combine and then cover with a lid.
Place in the oven for 2½ hours, until the beef is really tender.
Optional: Serve with creamy cauliflower mash.
This stew will keep in a covered container in the fridge for up to one week.
It can also be portioned and frozen.