I don't know if you know this variety of mushrooms (portobello) but if you find them and they are not very expensive, I encourage you to try them.
You can prepare them roasted or cooked with your Thermomix as I have done, so simple and with very few ingredients.
They look good as an aperitif or as Garrison. even with White rice or with pasta it is delicious.
Portobello mushrooms in Thermomix
Portobello mushrooms can be prepared easily with our Thermomix. With few ingredients we will have a tasty and very versatile dish.
Equivalences with TM21
More information - RBasic eceta: cook rice with Thermomix, Pasta cooking