Two founders of Queensland-born fast-casual concept Betty’s Burgers will launch a new venue in Sydney’s Inner West this December.

Slim’s Quality Burgers is set to open on 21 December in Marrickville Metro.

The menu is inspired by classic burgers that rose to prominence in the US during the ‘ ’50s and ’60s, with simplicity reigning supreme.

“In the vast Australian burger market, we too often see venues that are built on gimmicks and fads,” says Nik Rollinson, director of Slim’s.

“We think Aussies have come full circle and want something that is simple, affordable, and made from only the highest-quality ingredients.”

Beef burger options feature patties made from Australian Angus beef and there is also a vegetarian burger made with a plant-based patty.

Highlights include a classic cheeseburger along with the Slim’s Original (Angus beef, grilled onion, cheese, lettuce, tomato, pickles, Slim’s spread); Crispy Chicken Club (fried chicken breast, maple smoked bacon, lettuce, tomato, pickles, mayonnaise) and The Works (Angus beef, grilled onion, maple smoked bacon, cheese, lettuce, tomato, pickles, Drive-In sauce).

Fries will be made with local potatoes and fried to order. Diners can also add on toppings including cheddar cheese, maple-smoked bacon or grilled onion.

There will also be a dessert menu that hones in on sundaes, with options covering hot fudge, salted caramel and strawberry as well as an ice cream cup.

The Slim’s brand is slated to expand across the country in the coming months.