Hang Fire did it. So did Got Beef. And Dusty Knuckle too.
But each of these pop-ups were never longer than a couple of days a week over the space of a few months.
So, the more long-term relationship between Burger Theory and Kongs bar is a unique one. The Bristol-based burger makers already have a residency at Kongs in Bristol seven days a week and now they’re doing the same at the recently opened Cardiff Kongs.
Kongs is a nice place – it has a post-apocalyptic vibe with its subterranean setting, exposed concrete ceiling and reclaimed wood furniture.
The main selling points are a host of retro arcade games at a pricey £1 a play and a pair of table tennis tables that are free to use (except on Fridays and Saturdays when they’ll be charging £5 per half hour).
The beer selection is decent too. I had a citrusy pale ale from Wiper & True whilst Mrs G drank a Beavertown Gamma Ray.
Ultimately though, we were interested in the food.
Burger Theory’s menu is packed with interesting burgers from the Korean fried chicken burger to a Southern fried portabello mushroom with halloumi. There’s also funky sounding sides such as pulled ham dirty fries and a pork and venison scotch egg.
I ordered the Cheese theory (£8.75) – topped with a good ooze of cheddar, thin and crisp streaky bacon, shredded lettuce, sweet gherkins, red onion, mayo and homemade tangy ketchup.
Mrs G ordered the Sheriff (£9.25) – again topped with cheddar, bacon and lettuce as well as smoky barbecue sauce, tomato and golden onion rings.
Both were served in an excellent brioche bun with a golden glaze and a soft, sweet crumb that held together well.
The 5oz coarse Welsh beef patties were served a super juicy medium pink.
Both were first rate burgers. In fact, both were frigging awesome burgers.
The skin on fries were on the nail too (£2.95) – well-seasoned, fluffy and copious in quantity.
I like Burger Theory a lot and I can't wait to give the rest of their burgers a run for their money.
I've made a couple of return visits to Burger Theory to work my way through the menu. It was all lush
The Prairie Girl (£8.95) was one of the finest chicken burgers I've ever eaten - a hyper crisp crumb giving way to a tender chicken fillet. The accompanying brioche bun, tangy blue cheese sauce, fiery Franks hot sauce and lettuce slices were bang on.
A side of Korean Fried Chicken (£5.95) was excellent. Impeccably crisp-crumbed chicken thigh pieces were topped with a sticky and spicy chilli soy sauce and a good scattering of peanuts, spring onion and red chillies.
Coca cola pulled ham dirty fries (£6.95) tasted just as deliciously filthy as they sound. A huge bowl of super-thin crisp fries, shreds of sweet and salty ham, sticky barbecue sauce and a crust of melted cheese combined beautifully.
Disclosure - I was invited to Burger Theory for my first visit, all food was complimentary.
Address - Kongs Cardiff, Hodge House, 114-116 St Mary St, Cardiff CF10 1DY
Twitter - https://twitter.com/burgertheoryuk