Starch to substitute for cornstarch?
I can't believe I have no cornstarch. I always have cornstarch. I've already started the mise en place for lemon cookies which need it for crisping.
Will potato starch work? Tapioca? Arrrowroot?
I could just wrap up the ingredients and make them after a grocery delivery, but will potato work, specifically for cookies? Or arrowroot? Or tapioca?