Hunter Sauce

2 tablespoons minced onions
2 tablespoons butter
1 cup chopped mushroom
1/2 cup white wine
1/2 cup tomato puree
1 cup left over home made beef gravy (or brown gravy/brown sauce made from a packet such as Knorr's)
2 -5 drops maggi seasoning (or other flavor enhancer like Kitchen Bouquet, or even Worcestershire sauce)
salt and pepper

Saute onions in butter until very tender. Add mushrooms and saute additional 2- 3 minutes. Add wine, simmer, and reduce by half. Add tomato puree and gravy and simmer for 5 minutes. Adjust seasoning to your taste with Maggi, salt and pepper. You can also add your favorite herbs to this sauce.