Separate the egg, mix the egg yolks, beer, flour and parmesan to a smooth dough and let it swell a little. In the meantime peel the garlic and press it through a garlic press. Wash the chives and basil, dab dry and chop finely.
Mix mayonnaise, yoghurt, garlic and herbs, except for something to sprinkle on top. Season to taste with salt, pepper and lemon juice. Clean, wash and drain the salad. Wash and clean the tomatoes and cut them into thin slices.
Cleaning mushrooms. Heat oil in a pot. Beat the egg whites until stiff and fold into the beer batter. Dip the mushrooms into the dough with a fork, drip off a little and bake in the hot oil until golden brown. Remove with a skimmer and drain on kitchen paper.
Arrange lettuce and tomatoes on 4 plates and arrange the mushrooms with some sauce on top. Serve sprinkled with remaining herbs.