User blog comment:Xilinoc/Ch. 849 - Boiling Witches and an Ill-Fated Jaguar Husbando/@comment-68.62.209.22-20161208143520/@comment-26803131-20161208231441

And Luffy said he wouldn't eat anything if it wasn't made by Sanji's hand if I am remembering correctly. So this could be a goodbye meal using all his skills or a just in case you decide to go wild feast. Since it is Luffy after all (he was just challenging Big Mom a chapter or 2 ago).