Frida, who just casually baited Myne into promising to tell her a new cooking recipe.
(What, you think that promise was because she's being friendly?)
Whereas Benno made his offer for the 2-in-1 shampoo.
Though eventually Frida will also realize that when dealing with Myne it's better to be open about things, because if she ever feel afraid of you after getting cheated out of something, she'll always become wary of you.
(Although it's only if she feel so, if she's like 'meh, whatev' after getting cheated, you're fine....much to Benno's chagrin)