Jock, 43, who has previously spoken out about his unlikely sex symbol status, sent pulses racing in his Scottish garb.
"Jock in a kilt is the perfect intersection of my interests (my interests being food and Scottish men)," one wrote on social media.
Others were curious and wondered whether Jock was wearing the kilt in the traditional manner - that is to say with nothing on underneath.
"What's Jock got under his kilt???" one viewer questioned.
"Let's hope @Zonfrillo is wearing his jocks under that kilt," joked another.
Comedian Em Rusciano even penned: "I feel personally attacked that there isn't a dedicated Kilt cam tonight, I want cutaways to Jocks Sporran... SEXUAL INYOURENDO!"
Jock, who has worn his special tartan for special occasions including his wedding, has previously weighed in on his sex symbol status and finds it a little odd.
"Look, the whole 'Hot Jocklate' stuff is… It's unusual and weird and different. It's odd. It's pretty hard, honestly, to get your around [it]," the chef told TV WEEK.
"I'm in my mid-forties and a father of three kids with another one on the way!"
The MasterChef judge added: "I'm not scouring around the internet fishing for compliments and I'm pretty past enjoying that kind of attention – it makes me feel super awkward!"