1 medium onion, peeled, chopped
4-5 sprigs fresh thyme
3 tbsp plain flour
1 fresh bay leaf
500ml/18fl oz good-quality beef stock
salt and freshly ground black pepper
½ tsp fine sea salt
350²µ/12¼´Ç³ú self-raising flour
4-5 tbsp sunflower oil
1 tbsp tomato purée
butter, for greasing
175g/6¼oz shredded suet
700g/1lb 8¾oz well-marbled braising steak, trimmed, cut into 2.5cm/1in cubes
3 very fresh lambs' kidneys
200ml/7¼fl oz red wine