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Loads seem to add a specific soup or something .
This is due to a lot of “family” recipes being originally found on the side of boxes. Some of the poorer regions are famous for having random ingredients as substitutions, Sprite cake being a favorite. Basically the soda adds a leveling agent and liquid so you can leave out eggs when making boxed cake.
Eeyorecore
I think it's all the US recipes that basically have pre-prepared stuff as part of the ingredients list that gives that impression. Loads seem to add a specific soup or something .