Arrowroot Starch
Arrowroot starch is a fine white thickener used in fruit fillings, sauces, and puddings. It thickens without adding much flavor and is often used in gluten-free cooking.
Identity
Clear thickener
Useful for fruit fillings and sauces that need body.
Whisk arrowroot starch with dry ingredients or a small amount of cool liquid before heating so it disperses evenly. It thickens fruit juices gently and helps fillings slice or spoon cleanly.
Wikimedia Commons
Reference image
Arrowroot Starch reference image.

Source: Wikimedia Commons
Used In Recipes
Substitutions
Acceptable
Arrowroot Starch -> Cornstarch
3 tablespoons arrowroot starch or cornstarch
The source lists this as an alternative in the same ingredient row.
Source: Strawberry Rhubarb Crisp