Marinate the pork. To do this, cut the meat into small pieces. Add the pepper mixture, seasoning for meat, 1 tablespoon of vinegar and lemon juice. Mix and marinate in the refrigerator for 2 hours.
Marinate the onion. Cut the onion into rings, add 2 tbsp vinegar, 1 tbsp sugar, 4 tbsp water. Leave to marinate for 1 hour.
Proceed to baking the meat in the oven. To do this, prepare a baking sleeve, tie it on one side and put the marinated onion on the bottom. Put the meat on top. Tie the sleeve on the other side, make 3 punctures on top of the sleeve. Put it in the oven preheated to 190 °C to bake for 25 minutes.
After 25 minutes, remove the sleeve and cut it open, bake the meat for another 10 minutes in the open position.