As survivors waded through Harvey's devastation, one New York City firefighter swooped in to help — and fell in love.

Lt. Thomas Carrera tried Whataburger for the first time Saturday while helping Texans recover from the hurricane. The moment was captured on video, posted on Twitter and shared 10,000 times by Sunday evening.

Carrera was skeptical at first, like many visitors who hear Texans bragging about the famous hamburger chain. The video shows the firefighter as he opens a yellow wrapper and stares down at his burger.

"These guys want to tell me this is the burger, this is the official Texas burger," Carrera says. "I don't think so, but we're going to see right now."

A man chuckles behind the camera.

"It's a double?" Carrera asks.

Well, yes. Someone off camera reminds him this is a Texas burger.

"Oh, everything is bigger in Texas, right?" Carrera says.

He takes a bite, and his face scrunches.

"Mmmmm," Carrera says. "That is a good burger."

He turns to the camera and gives a thumbs-up: "Unbelievable."

While serving first responders we ran into a NYer who got his first sweet taste of Whataburger pic.twitter.com/AzYbryw8cn — Whataburger® (@Whataburger) September 2, 2017

The New York City Fire Department has deployed more than 50 of its members to Texas, where they are assisting with search-and-rescue, coordinating relief efforts and driving supplies to areas hit by the storm.

Whataburger tweeted a thank-you to Carrera and other emergency workers in southeast Texas.

"Was great meeting you yesterday!" the restaurant wrote.

Carrera continued the lovefest on Twitter, calling himself a loyal Whataburger fan and thanking the burger chain for "showing me the light."

Thank you for showing me the light @Whataburger Your followers enjoyed watching the birth of a loyal whataburger lover It's in my veins now — Thomas Carrera (@ThomasCarrera) September 3, 2017

I deserve nothing more then the hospitality you have shown me !! Texas the most pride in the union ! — Thomas Carrera (@ThomasCarrera) September 3, 2017

I Don't want to leave ! — Thomas Carrera (@ThomasCarrera) September 2, 2017

Yep...that's some good eatin', isn't it??? Thanks for coming to help us out!! We appreciate ya! — The Mad Hatter of Austin (@cjkeller) September 2, 2017

Earlier this week, Gov. Greg Abbott grabbed a Whataburger meal in the restaurant's hometown of Corpus Christi, which was battered by Harvey on Aug. 25.

In his view, it wasn't just another Whataburger run.

"Now I know Texas is on the road to mending," he tweeted. "I had Whataburger in Corpus Christi."