Wil makes several varieties of side dishes with mushrooms, but I usually just do this. I have no idea how it tastes, because I am deadly allergic to mushrooms, however most of my family loves them. Only one son is also allergic.
What you need: 200 gr of mushrooms per person; 1 Tbs margarine for frying; pinch of salt and 1/4 tsp pepper per person, 1 Tsp each of dried minced onion and garlic per person; 1/4 to 1/2 tsp of crushed red chillies per person.
What you do: wash and slice the mushrooms. Heat the margarine in a skillet, Add sliced mushrooms and cook over med high to brown. Stir often to get all slices browned on both sides. Add all the spices, and reduce heat, continue cooking for 4 - 5 minutes, stirring a few times. Serve.
Wil cooks these on the BBQ sometimes, and if you want to do that, you will need a heavy bottomed pot which is cast iron, or enamelled iron. You do the same thing, basically, but when the browning is finished, place the pot on the top shelf of the BBQ and cover to finish cooking.