Soak the beans in water for several hours.
Cook the beans in plenty of water until they soften - but not too much. They should be al dente. (How to check? Spend a little time and place on a board. As soon as it is possible to squeeze the lentil with your thumb completely – its ready)
Meanwhile, coarsely chop the onions.
Heat the olive oil in a pan.
When the oil is hot - Fry the onions until they become translucent.
Sprinkle the brown sugar, balsamic vinegar and wine vinegar.
Cook everything on low flame for half an hour.
Mix with lentils
Add black pepper, salt and balsam vinegar.
Mix it all - and serve hot.
Bon Appetit!