Mix lemon juice, sugar, salt, pepper and mustard. Finally, fold in the oil. Peel onion, dice finely and stir in
Clean, wash and drain salads well. Pluck radicchio and lettuce leaves into bite-sized pieces. Clean, wash and thinly slice mushrooms
Add the salad ingredients to the marinade and mix loosely. Arrange on four plates and garnish with lemon slices and peel if desired