n 1. In a 12" pan, melt the butter in the oil, add the rehydrated mushrooms and saute at low-medium heat for several minutes.n 2. Add the fresh mushrooms and continue sauteing at low-medium heat until they have softened and the sauce is slightly reduced.n 3. Add the garlic and continue for 2 minutes.n 4. Add the cornstarch to the mushroom liquid, mix and put back in the pan to thicken the sauce. Cook this down for about 10 minutes until sauce has right consistency.n 5. About the time when you add the mushroom liquid to the pan, place the pasta in salted and oiled boiling water and cook according to package directions for al dente, usually about 8-10 minutes.n