Brush the black salsifies thoroughly under running water, peel them and place them in weak vinegar water so that they do not discolour. Cut into bite-sized pieces. Melt the fat, add the black salsify, add 75 ml of water and stew covered for 15 minutes. Season with salt and pepper. Clean, wash and drain the salad.
Arrange on four plates. Wash and halve the tomatoes. Arrange on the lamb's lettuce together with the black salsifies. For the vinaigrette, mix vinegar, salt, sugar and pepper, add oil. Pour over the salad, sprinkle with hazelnut leaves