Peel and finely chop the onion. Wash parsley, dab dry and chop finely. Mix mustard, onion and vinegar. Season with salt, pepper and sugar. Stir in half of the parsley.
Whip the oil into it. Put eggs in boiling water and cook for 9 minutes. Then drain, quench, peel and halve the eggs. In the meantime clean and wash the salad, pluck into bite-sized pieces and drain well. Clean, wash and quarter the radishes. Clean, wash and cut radish into thin slices. Wash the sprouts and drain well on a sieve. Mix salad, radish, radishes and sprouts. Pour vinaigrette over them and mix.
Clean, wash and quarter the radishes. Clean, wash and cut radish into thin slices. Wash the sprouts and drain well on a sieve. Mix salad, radish, radishes and sprouts. Pour vinaigrette over them and mix. Serve the salad sprinkled with egg halves and the remaining parsley