Ingredients 1 kg (2 lb) chuck steak or gravy beef (or any slow-cooking beef), cut into bite-sized pieces 1 tsp salt 1/2 tsp pepper 2 tbsp olive oil , divided 1 large onion , roughly diced 3 garlic cloves , roughly chopped 500 g (1 lb) mushrooms , sliced 2 tbsp flour 2 tbsp tomato paste 1…