Arrowroot is easy to use as a thickening agent - simply put a teaspoon into a bowl or mug and add a little water to make a paste - then add a spoon of the sauce you wish to thicken, mix it up and pour all the contents of the mug / bowl into the sauce. Arrowroot adds a lovely sheen to the sauce as well as being less prevalent to lumping up. To switch from a gluten diet to one of arrowroot, substitute one teaspoon of arrowroot for one tablespoon of wheat flour, or two teaspoons of arrowroot for one tablespoon of cornstarch.