How did Olenna put the poison in Joffrey's Cup?

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Tags

1. #attached
2. #hidden
3. #worked
4. #dontos
5. #littlefinger
6. #stone
7. #given
8. #sansa
9. #arranged
10. #reality
11. #hollard
12. #olenna
13. #which
14. #deliver
15. #necklace
16. #poison
17. #poisoned
18. #process
19. #stark
20. #tyrion
21. #joffrey