Condiments at the ready: Sydney's biggest burger celebration is returning for its fourth year. Burgapalooza will fill Paramatta's Prince Alfred Park with the aroma of grilled beef and zesty pickles on September 21 and 22. This time around, there's an even bigger line-up of burger authorities churning out the bun-and-meat meals.

Down N’ Out, BL Burgers, Burger Head and Mister Gee’s will all return after flipping plenty of burgers last year. Brisbane's best fried chicken-monger, Fat Belly Jacks, will make its way to Sydney for the first time, burning mouths with its Nashville hot chicken burger.

Black Bear BBQ has partnered with Fireball Whisky for a pig spit and Jimmy's Burgers has teamed up with Birdman on a fried-chicken collaboration. Expect Newcastle's Newy Burger Co to be dishing up some new creations and Wahroonga's Burger Hounds will be showing up at the fest for the first time ever.

There'll be a bunch more veggie burgers, too, thanks to a collaboration with the Alternative Meat Co, which will be supplying plant-based patties to vendors. All burgers will be $12 and slightly smaller than regular burgers, so you can fit more in.

This year there will also be a "food fountain" by Pure Dairy, with free cheese sauce dripping onto whatever food you prefer. Once again chilli-lovers can prove themselves with a chilli-eating competition, and wash everything down with beers from Coopers brewery and Fireball Whisky cocktails. Plus, DJs will play hip-hop, funk and soul tunes, all on vinyl.

A huge inflatable Menulog obstacle course will also give burger-lovers the chance to win free burgers and vouchers. Participants will wear giant inflatable delivery bags as they complete the course, which will include finding a set of keys in a tyre pit, pushing their way through a wind tunnel and dodging water balloons pelted by onlookers.

This year, all ticket-holders will also get $15 to redeem on Menulog for even more burgers.

Burgapalooza runs on September 21 and 22, with sessions from 12pm to 4pm and 5pm to 9pm. Tickets are on sale here.