Dice the meat into cubes, cut the onions and sweet peppers into crescents, the mushrooms - into slices and the chili peppers – finely.
In a deep frying pan with oil, stew the onions, sweet and chili peppers. Once tender, add the chicken and after about 5 minutes – add the mushrooms.
Cook the meat to redness and pour in the tomatoes. Season with salt, sugar and black pepper.