On the eve of boil until cooked potatoes in their skins. Clean it and cut into thin slices, add the vinegar, salt and pepper, mix well. Heat the vegetable oil in a frying pan, saute the red onion, cut into small cubes. Pour in the broth, bring to a boil, pour the cooked potato mixture. Fry the bacon to a crisp, add the greaves to the salad and season to taste.