Below Deck Mediterranean 's Chef Johnathan "Jono" Shillingford is making a splash with his latest dinner menu in the worst way possible. In E! News' exclusive sneak peek at the Bravo series' Aug. 26 episode, the season nine yachtie prepares a luxurious plate of tuna carpaccio with pineapple caramel for the new charter guests.

The only problem? One of the vacationers, Jennifer , is deathly allergic to the dish being served to her. "It looks beautiful," she comments in the preview as everyone digs into the fish. "I would eat it if I could.

" And when one of her friends asks why, Jennifer explains, "Because I can't eat raw seafood because it could kill me. In my preference sheet I said it about 15 times that I can't have it." Though Jennifer is a initially a good sport about the mix-up, she's forced to tell Captain Sandy Yawn about the potentially fatal oversight when she checks on the guests during their meal.

"I would eat it if I could, but I have iron overload," she tells Sandy. "It might kill me if I eat it." Needless to say, the captain is not happy and assures Jennifer, "I'm gonna handle that!" In a confessional, a fuming Sandy adds, "What the f--k?! This is unacceptable.

" The Captain then confronts Jono in the galley. "One of the guests, it's on their preference sheet, raw seafood will kill her," she tells him. "And it's in front of her plate.

That's a big screw-up." Jono's reaction? "F--k me, bro." See if Jono's mishap leads to a firing when Below Deck Med airs Monday at .