Cut the tofu into slices and marinate in soy sauce and sesame oil for about 15 minutes. In the meantime, grind the peanuts coarsely or chop them finely with a knife. Peel onions and cut into thin rings.
Rinse lentil sprouts well in a sieve under running water. Clean, wash and drain the lamb's lettuce. Mix the vinegar with 3 tablespoons of water, add 1 tablespoon of oil. Season with salt, pepper and sugar.
Whisk the egg. Carefully turn the tofu slices in flour, pull through the egg and roll in the ground peanuts. Heat the remaining oil in a frying pan and fry the breaded tofu slices on both sides for approx. 3 minutes until golden brown.
Carefully mix lamb's lettuce, onion rings and sprouts with the marinade. Arrange tofu slices and salad on plates.