mallyh, I discounted pretzel as they they didn't originate in the UK.
What's the origin of wassail?
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The term “wassail” can trace its origins to pre-Christian Britain. Anglo-Saxon tradition included a New Year celebration in the halls of the Lord of the Manor, including a mighty feast with a giant bowl of a sort of punch: a mix of cider, ale and mead infused with bountiful spices and crab apples.