How to substitute: As a general rule of thumb, use twice as much flour as cornstarch or arrowroot. Cornstarch is a super-effective thickener that doesn’t need much time to cook, although it does ...

Remember, cornstarch loses its thickening power at very high temperatures, so add it toward the end of cooking. Arrowroot is an excellent, gluten-free, and paleo-friendly thickener that works well ...