Beef and Chestnut Mushroom Casserole - Irish Beef

Ingredients

• 2 tbsp olive oil
• 25g (1oz) butter
• 900g (2lb) topside or stewing beef, trimmed and cut into 1 inch cubes
• 450ml (¾ pint) Guinness or stout
• 1 tbsp tomato puree
• 600ml (1 pint) beef stock (from a stock cube is fine)
• 1 bay leaf
• 1 tsp chopped fresh thyme
• 1 tbsp Worcestershire sauce
• 225g (8oz) small chestnut mushrooms, trimmed
• 225g (8oz) pearl onions or small shallots, trimmed and peeled (with root intact)
• salt and freshly-ground black pepper
• celeriac and potato mash and sprouting broccoli, to serve
• Ingredients
• Method