Step 1
Start by boiling rice in salted water. You can use any long-grain variety; I prefer basmati.
Wash the mushrooms, remove the stems, and place the caps on a greased baking sheet like little cups.
Step 2
Roughly chop the onion and lightly sauté it in vegetable oil. Then add the chopped mushroom stems and continue frying until golden.
Step 3
Add the cooked rice to the pan, season with salt and pepper to taste, and mix well.
Step 4
Stuff the mushroom caps tightly with the mixture and bake at 190°C for about 20 minutes.