Considering how silly this question is, I've had this discussion with an inordinate number of people. I've seen evidence going both ways, with no definitive source out-legitimizing one side of the debate.
Please enlighten me: Is the plural of grapefruit "Grapefruits?"
Personally, I like grapesfruit.
Initially this started as a vintage tattoo style drawing of a scroll, but the fonts ended up looking more like an advertisement for buying grapefruits.