All-Purpose Flour with Cornstarch (Best Option)
For every 1 cup cake flour, use 1 cup all-purpose flour minus 2 tablespoons, plus 2 tablespoons cornstarchCake flour is low in protein (about 7-8%) which limits gluten formation, resulting in a tender texture. All-purpose flour has higher protein (10-12%), but by removing 2 tablespoons and replacing them with cornstarch (which contains no gluten), the overall protein content is lowered, mimicking cake flour's properties. This helps create a delicate binder that holds burger ingredients without toughness.
To succeed, mix the all-purpose flour and cornstarch thoroughly before incorporating into the burger mix. Avoid overmixing the burger mixture to prevent gluten development, which would toughen the texture.
Compared to using cake flour, this substitute produces a similarly tender and cohesive burger binder, maintaining juiciness and a pleasant mouthfeel without adding chewiness.