Peppered tuna steak with bordelaise sauce and seared broccoli

By Glynn Purnell From Saturday Kitchen Ingredients For the bordelaise sauce knob of butter 1 large shallot, finely diced 2 garlic cloves, crushed ½ leek 1 thyme sprig 1 bay leaf 300ml/10fl oz red wine 300ml/10fl oz beef stock 150g/5½oz bone marrow, diced 1 tbsp …