Why is a gherkin called a Wally?

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Tags

1. #olives
2. #corruption
3. #which
4. #wally
5. #enjoyed
6. #century
7. #europeans
8. #arrived
9. #eastern
10. #stuck
11. #served
12. #known
13. #slang
14. #pickled
15. #hence
16. #alongside
17. #cucumbers
18. #london