Great snack.
Cut the tomatoes in half, remove the core.
Rinse the mushrooms well, drain, chop into small cubes, lightly fry in a pan with onions.
Grate the cheese on a fine grater, add some to the cooled mushroom mince, leave some for decoration. Add finely chopped green onions.
Fill the tomato halves with minced meat, lay on lettuce leaves, sprinkle with cheese and green onions.