Francois is Ryusui’s butler, and they just got out of the stone by Gen and a few others because senku needed a cook and they know how to cook very well because senku Ryusui and you tried to cook and you failed burning everything so they made their way to wear. The rest of the group was gen following behind

Senku: I’m never cooking again

Ryusui: that that’s probably for the best

Kohaku: I thought it tasted fine

Chrome: same

Ukyo: you guys don’t know what good food tastes like

Ruri: well we can always try again

Nikki: I would rather not eat anything they make again

Suika: it could’ve been worse

Ryusui: she has a point

Francois and gen made it there Gen was out of breath Francois looked perfectly fine