Some quick searching and it looks like multiple brands of sanpin-cha all use similar color schemes. So it is probably meant to depict just the Okinawa specialty more than any brand in particular.
Zombie Land Saga used to do similar things where the eye catch scenes in the middle of the show would depict them all using/eating/visiting iconic Saga Prefecture things.
I have yet to watch 86. I know I will love it, but I have been trying to convince my wife to watch it with me. We are slowly working through the new season of Kenshin and Natsume right now though. Maybe someday.