Cut the fillet into strips. Stir starch, egg white, soy sauce, sherry and sesame oil until smooth. Marinate the fillet for two hours. Clean the bell pepper and cut into fine strips. Peel and halve the pineapple and remove the hard stalk.
Dice the flesh. Peel and finely chop the onion and ginger. Cut the chilli into rings. Drain the flesh, catch the marinade. Mix marinade, tomato puree, vinegar and sugar. Heat the oil in a wok.
Brown the meat well in it, push to the edge. Steam vegetables and pineapple for three minutes. Add sauce and steam for another two minutes. Basmati rice and black tea goes well with it.