Slice the mushrooms and keep them aside.
Slice the fresh shiitakes and put them in a large skillet.
Now add all the remaining ingredients except the cashews and cook over high heat for about 2 minutes, stirring the mixture frequently, until the mushrooms and onions are softened.
Then add the cashews and toss them well.
Now transfer this to an attractive serving dish and garnish it with fresh sage leaves.
The delicious mushroom medley is ready.