Mix vinegar with salt, pepper and sugar. Finally, fold in the oil vigorously. Clean, wash and drain the dandelions. Pluck the leaves into bite-sized pieces. Cut tomatoes crosswise, blanch and peel the skin.
Cut the tomatoes into eighths and remove the seeds. Peel and finely chop the onion. Wash the tarragon and pluck the leaves. Beat the eggs one by one in a soup ladle and carefully slide them into boiling salt-vinegar water.
Leave to simmer for 3-4 minutes. Mix dandelion, tomato cake, onion, tarragon and the marinade. Arrange the salad on four plates. Remove the eggs with a skimmer, quench and drain.
Arrange on the salad and sprinkle with pepper.