Soak the mushrooms in lukewarm water in a bowl. Clean and wash the carrots, peppers and leek. Cut carrots and leek into slices or rolls, peppers and bamboo into strips.
Wash the bean sprouts. Cut meat into strips. Roast the cashew nuts in a hot wok until golden brown. Remove. Heat two tablespoons of oil in it. Fry the meat in portions while turning. Season with salt and pepper and push aside.
Drain the mushrooms well on a sieve. Pour the remaining oil into the wok. Stir-fry the vegetables and mushrooms briefly. Add stock. Continue cooking for five minutes. Fold in meat and cashew nuts.
Season with salt, pepper and mushroom-soy sauce.