2 medium onions, diced
30g/1oz plain flour
a dash of Worcestershire sauce
850ml/1陆 pints beef stock
salt and freshly ground black pepper, to taste
2 tbsp vegetable oil
1 egg and 1 extra egg yolk beaten together
300g puff pastry
700g/1lb 9oz braising steak, diced
200g/7oz lamb kidney, diced