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 has a lower protein content (7-9%) compared to all-purpose flour (10-12%), which results in less gluten formation and a softer texture. Adding cornstarch dilutes the protein in all-purpose flour, mimicking cake flour’s properties. This balance is crucial in focaccia to achieve a tender yet chewy crumb.
To succeed, thoroughly sift the all-purpose flour and cornstarch together to ensure even distribution. Avoid over-kneading the dough to prevent toughening. Monitor hydration as this substitution may slightly absorb less water.
The final focaccia will have a slightly lighter texture than using straight all-purpose flour, with a tender crumb and good chewiness, closely resembling the original cake flour-based dough.