Asian Pork Tenderloin with Caramelized Onions

Melt butter with olive oil in a pan. Add onions and cook until caramelized. Add ginger and garlic along with sherry to pan and cook for a couple of minutes while deglazing the pan.

Add hoisin, soy sauce, tomato paste, brown sugar and five-spice powder. Cook until sugar melts and sauce has heated through. Let cool.

Trim excess fat from meat. Place in a large zip lock bag. Pour cooled onion sauce mixture over the meat. Turn to coat completely. Let marinate for at least one hour but not more than 24 hours.

Heat oven to 450 degrees F. Put roast on a rack in roasting pan. Cover with onion mixture. Insert meat thermometer. Cook 30 to 35 minutes or until internal temperature reaches 160 F. Don't overcook or meat will be dry.