Cut the meat into small pieces. Marinate meat with onions for at least 5 hours. Mix sugar, vinegar and vegetable oil, salt and pepper. Cut the onion into rings and pour the marinade for 8 minutes, then drain the liquid. Heat oil in a pan, evenly fry the meat until half cooked for about 7 minutes. Salt, pepper to taste.
Wash the potatoes, peel, cut into medium-thick circles, add to the pan and fry together with the meat for 20 minutes over medium heat.
Finely chop the garlic, put in a pan, reduce heat, close the lid and simmer ojahuri for 5 minutes.
Wash the tomatoes, cut into small pieces. Wash cilantro, finely chop. Add the tomatoes and cilantro to the pan, simmer the ojahuri under the lid for another 20 minutes.