Episode 2×8 Into The Deep is when the ketchup line came up.
Gold said to Belle “Condiments are this world’s most powerful magic”
In case you wanted to know.. Who knows, maybe condiments will be used to take down Zelena. Lol!
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Nothing is impossible on OUAT. Everything has a way of repeating itself. Keeper of the Keeper tread: https://oncepodcast.com/forums/topic/official-keeper-thread-3/#post-217924