You really don't need to ask permission to RP exotic foods like that, other then in a situation where any technical transaction might happen (no one will give you coins for invisible foods). Its safe to assume that so long as the food you RP is at least period friendly; i.e. best not catch you munching on a pop tart
; that it would be considered acceptable RP.
Also if you'd like more foods added in the VBU (Do not doubt the Dev's for we know not what they do
) Then you should make a features request on Mantis, along with some thought out ideas of what sort of things you would like to see and how they would fit in with the current foods in game, speaking in the sense of the foods nutritional value; would the food be a diet improving item or diet decreasing item. The idea may get accepted, it may not or it may be put on the back burner for other more pressing matters, but if you post it on mantis at least be sure that it will be looked over rather then ignored.
p.s. It never hurts if you can provide graphics for such items, or find someone willing to do so.