All-Purpose Flour (Best Option)
1 tablespoon per cup of liquidAll-purpose flour has a moderate protein content that allows it to thicken liquids effectively without creating a heavy or gummy texture. In stew, it helps achieve a balanced viscosity similar to cake flour.
To avoid lumps, mix the flour with a small amount of cold water before adding it to the hot stew. Stir continuously and cook for several minutes to eliminate any raw flour taste.
Compared to cake flour, all-purpose flour may produce a slightly denser texture but remains the closest functional substitute for thickening in stew.