Preparation
1. Cut the potato into slices of about 1 cm, cook in salted water over a low heat for about 10/12 minutes, add 2 tablespoons of white vinegar and a bay leaf until the potato is cooked, being careful not to let it become mushy.
2. Clean the beetroot and cut it into slices as you would for the potato.
3. Drain the quantity of lampascioni you wish to eat
4. In a cup, mix 4/5 tablespoons of fig balsamic vinegar, a few drops of lemon, a pinch of white pepper and a hint of mustard.
5. Arrange the roast beef slices on the plate, placing them on the salad leaves
6. Place the slices of potatoes, beetroot and lampascioni next to the roast beef
7. Spread the sauce over everything except the lampascioni.