Steak and kidney pie Ingredients 2 tbsp vegetable oil (approx.) 2 tbsp butter (approx.) 2 onions, chopped 90g button mushrooms, halved 200g lamb kidney, diced 600g braising steak, trimmed and cut into 1cm cubes 1 tbsp plain flour salt and pepper leaves from 3 sprigs thyme 1 bay leaf 600ml beef stock beaten egg to