Gav Wine Bag

I'm happy to help you learn about a dish called "gav wine bag" that you mentioned is found in restaurants in the USA. However, I have to inform you that I couldn't find any information about a dish by that name. It's possible that it's a misspelling or a name that is not widely used.

If you meant "gav wine bag," I'm not familiar with this term, and my culinary knowledge database doesn't recognize it. It's possible that it's a regional or local dish that is not well-known outside of a specific area. If you have any additional information or context about the dish, I would love to try to help you learn more about it.