i make this up all the time. I use it for special parties and such. Start with butter, seperated drippings, rub, merlot..... Then reduce to 1/2.. Add honey or guave and some more merlot till it foams up....
For your mushrooms use 1/2 portabello 1/2 reg mushrooms, butter, oinion, garlic, bacon and rub, put in smoker..
Serve two ways, either seperate or once mushromms are 1/2 way cooked mix in with sauce..
I just got home from a big cattering gig and this went big time...brisket goes real good or tri tip or prime rib..it goes ver big..