Clean, wash and spin dry the lamb`s lettuce. Cut out the stems of the tomatoes in a wedge shape, cut the tomatoes into slices. Dice the mozzarella.
Mix the balsamic vinegar with salt and pepper, fold in 6 tablespoons of olive oil.
If necessary, cut the oyster mushrooms in half and fry them all over in the remaining olive oil. Pepper and salt.
Arrange the lamb`s lettuce, tomatoes and mushrooms on an ovenproof plate. Drizzle with the vinaigrette and sprinkle with the mozzarella cubes. Bake in a preheated oven at 250 degrees (gas 5 - 6, convection 2 minutes at 200 degrees) on the top shelf for 2 - 3 minutes.