White Grapes

[masma]

What can we do with very sour white grapes other than wine?

[gingejbee]

Anybody you don't like in hospital?

[masma]

Ha ha not at the moment.

[atalanta]

It used to be common in mediaeval recipes to find "verjus" or "verjuice" among the ingredients. This was the unfermented juice of underripe grapes. One thing I think it was used for was the cooking of fish, but you'd have to do a search on "verjuice" to get precise proportions.
Then squeeze your grapes.