Oh! That little bottle is filled up with a extract made from Meteor Garlic~ It's basically Aria's stamina "secret weapon" for her cooking, since the properties of Meteor Garlic are extremely potent, boosting muscle mass and stimulating the body into action. It's technically an illegal ingredient though, so she tries to only use it for emergencies and the odd time she might need to give herself a boost to defend herself. Only a couple drops are needed for a few hours worth of effect, so a little goes a long way!

Aww, that's a bit of a shame. But understandable. >//o; That's why it's cool that there's other options for character professions, like gourmet revivers, gourmet knights, and such, even if chefs are among the most prominent. I know that Ironclad's gourmet hunter character isn't actually very keen on cooking and eating much rare and delicious food himself, so it is doable to have a character that's a bit more disconnected from the "rules" of the Gourmet Age in Toriko's world. x3 Though yeah, being a horrible cook wouldn't really get anyone terribly far... and it's at least fortunate that there seem to be so many talented cooks to make up for those who can't or won't cook. *laugh*