Finely chop the onion. Beat the egg lightly. Add to the minced meat. Season the minced meat with salt and pepper and mix.
Lightly wipe the mushrooms with a damp cloth or as I remove the skin from them.
If the mushrooms are large, then cut into 2 parts. In a greased form, put the mushrooms.
Put the prepared minced meat on the mushrooms and sprinkle with red ground pepper. Put in preheated to 190 gr. cover the oven with foil for 25-30 minutes. Check the readiness with a dry splinter. Open the foil, add the tomato halves and bake for another 5-7 minutes.
Take out, cool to 45-50 gr. Decorate with greenery and treat! Bon Appetit!