Cut the ox`s mouth lengthways and crossways into pieces about 2cm in size. Put the meat in a bowl.
Finely chop the onion, pickles and tomatoes and add to the meat. Season to taste.
Add the vinegar and oil and mix well. Cover and let stand for 1-2 hours. Stir every now and then, if necessary, add a little vinegar and oil. The salad should taste sour, but not sour.
TIP:
The salad can also be prepared the day before and left to rest in the refrigerator.