I was at a friends house and she had served roast beef and gravy. The gravy was unbelievable, I could have just drank the gravy it was so good. I asked her how she made her gravy and she laughed at me. She showed me that it was a brown gravy mix with a secret ingredient. "What could this secret ingredient be?" I thought to myself, I need to know. After a little prodding, I wriggled it out of her. Balsamic vinegar. Huh? How could that be? I didn't believe her, I thought that she was pulling my leg. So the next time I made a package of brown gravy, I tried a little balsamic vinegar and low and behold, she was right. I had to experiment with it a little and found the formula to be this:
1 package of brown gravy mix (prepared as directed) + 1 teaspoon balsamic vinegar.
Sounds odd, but nobody will believe you that you are serving them brown gravy mix from a package. Or, they will want your recipe. It will be up to you if you want to dilvulge the secret. It could be just between you and me.