Wash the meat, dab dry and cut into strips. Clean, wash and cut the peppers into pieces. Peel onions and cut into slices. Prepare rice in boiling salted water according to package instructions.
Heat the oil in a large frying pan. Brown the meat in it thoroughly. Season with salt and pepper and remove. Fry peppers and onions in the frying oil for 4-5 minutes. Add meat, stock, ketchup and vinegar to the vegetables, bring to the boil.
Season again with Sambal-Oelek and salt. Pour the rice onto a sieve and drain. Serve pork "sweet and sour" with the rice.