1 head of garlic (about 12 cloves), cut in half 5 thyme sprigs, leaves picked, plus 1 extra 1.8kg beef sirloin 3–4 tbsp olive oil 4 large onions, sliced 150g plain flour 500ml red wine 1.5 litres hot beef stock Rub the garlic halves and thyme leaves all over the beef. Place the joint in…