We recommend: Rapunzel Organic GMO Free Corn Starch ($8)
Flavor Notes: With low gloss and a mild, sweet flavor, cornstarch thickens gravy immaculately, especially if there is dairy present.
How to use: You'll need one-half tablespoon per cup of liquid. Whisk cornstarch in a tablespoon of cold water to create a slurry. Then whisk slurry into hot liquid. Stir for about one minute until it thickens.