Then add a spoonful of tomato paste.
I first put it in the middle of the pan and fry it well without vegetables, and then start to mix evenly.
All this takes another couple of minutes.
At the end, add finely chopped parsley and lentils. Mix everything well, let it warm up.
Salt to taste and add vinegar.
Vinegar gives all the piquancy to the salad, so it is added 4 or 5 spoons.