Boil eggs for 10 minutes and quench. Wash the radicchio and oak leaf lettuce and chop them up roughly. Wash, clean and slice the mushrooms. For the sauce, peel eggs and dice finely.
Cut the bacon into fine strips, fry until crispy in a pan and drain on kitchen paper. Cut off the cress. Season vinegar with salt, pepper and sugar, then slowly stir in the oil.
Stir in the egg cubes, bacon and cress. Arrange salad and mushrooms on four plates and pour the sauce over them.