Ingredients: 2 tablespoons olive oil 1.5kg diced beef chuck or blade steak 2 large onions, cut into thin wedges 2 leeks, white part only, sliced 2 garlic cloves, crushed 4 sticks celery, trimmed, sliced 2 large carrots, peeled, cut into 3cm pieces 2 x 425g cans diced tomatoes 1/4...