A gooseberry, or a drink or preserve made from gooseberries.
From Old French 'grosete' or 'grosel,' related to 'grosse' (coarse or large), as gooseberries are relatively large berries. This evolved into English as 'grozet.'
Gooseberry wines and preserves were huge in medieval Europe, and 'grozet' specifically referred to a gooseberry drink—you'd see this word in old tavern records and estate kitchen accounts.
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