Time Out says
Established in 2008, Gilbert Burger is one of the OG's of gourmet burgers in Seoul. It started with a small shop in Seocho-dong and expanded into several other locations in Seoul, including Itaewon, Gwanghwamun, Sinsa-dong and Samseong-dong. Gilbert Burger offers two patty sizes (140g and 200g) and 10 kinds of burgers to choose from. Notable burgers include the Juicy Cheesy (stuffed with cheese), the Green Light (pepperjack cheese, jalapeños, green chili and chipotle mayo) and the Rocket (blue cheese, gruyere, caramelized
onions, arugula and bacon). The Gilbert Burger comes with sweet potato fries. In addition to their regular fries, you’ll also find onion rings, corn salad and chili on the menu. And a nice surprise? Root beer and Dr. Pepper floats.