This is pretty racist, "mon".
So the op has taken a ridiculous stereotype as the starting point. I wouldn't be that offended.
But jamming another black stereotype on top by calling it "ask jemima" an obvious reference to Aunt Jemima. People already consider that imagery to be racist. http://www.nydailynews.com/news/national/racially-insensitiv... I think combining both of these together so haphazardly is a pretty bad idea.
Anyway, to the op: best of luck with your company.
Actually my cofounder's grandma is pretty much the type portrayed: that's where we took the inspiration from.
It's obviously a humorous reference.
EDIT: See what I mean?
[0] http://www.huffingtonpost.com/kadia-blagrove-/cultural-appro...