What Is Arrowroot Powder?
When to pick arrowroot instead of cornstarch or tapioca for a sauce or a pie is covered in cornstarch vs tapioca vs arrowroot. This guide is what the powder is and how to cook with it on its own.
Arrowroot powder (also called arrowroot starch or arrowroot flour) is a fine white starch extracted from the rhizomes of Maranta arundinacea, a tropical plant native to South America and the Caribbean. The starch is extracted by washing, peeling, and drying the rhizomes, then milling them to a powder. The result is a flavorless, odorless starch that is naturally gluten-free and valued for its gentle thickening properties and neutral taste.
The name derives from its traditional use by Indigenous peoples of South America to treat arrow wounds -- the poultice was believed to draw out toxins. Today its use is entirely culinary, though its gentle reputation persists: arrowroot is often recommended for people with digestive sensitivities because it is easy to digest compared to other starches.
Why Arrowroot Powder Excels as a Gluten-Free Thickener
Arrowroot powder has several properties that distinguish it from the more common thickeners:
- Clarity: Arrowroot produces a clear, glossy gel -- ideal for fruit sauces, glazes, and dessert fillings where a clean presentation is important. Cornstarch produces a cloudier result.
- Neutral flavor: Unlike flour-based thickeners, arrowroot contributes zero flavor, so it does not mask delicate tastes in sauces and custards.
- Acid stability: Arrowroot thickens well in acidic recipes (lemon curd, fruit compotes, tomato sauces) where cornstarch can break down and thin the sauce.
- Freeze-thaw stability: Arrowroot holds up better than cornstarch after freezing, making it a better choice for sauces and gravies intended for the freezer.
- Lower thickening temperature: Arrowroot gels at around 140-158 degrees F (60-70 degrees C), slightly lower than cornstarch, allowing thickening without prolonged high-heat cooking.
How to Use Arrowroot Powder
The method matters as much as the quantity. Arrowroot, like all starch thickeners, must be mixed with a cold liquid before being added to hot dishes to prevent lumping:
- Measure the arrowroot into a small bowl.
- Add an equal volume of cold water (or other cold liquid from the recipe) and whisk until smooth -- this is called a slurry.
- Add the slurry to the dish during the last 5-10 minutes of cooking, stirring constantly.
- Reduce heat to medium-low once the sauce begins to thicken. Do not boil vigorously after adding arrowroot -- prolonged high heat breaks down the starch and thins the sauce.
- Serve promptly. Arrowroot-thickened sauces can thin out if kept on the heat too long or reheated repeatedly.
Substitution Ratios
| To replace | Use arrowroot | Notes |
|---|---|---|
| 1 tbsp cornstarch | 1 tbsp arrowroot | Direct 1:1 swap for most thickening |
| 2 tbsp all-purpose flour | 1 tbsp arrowroot | Flour has lower thickening power |
| 1 tbsp tapioca starch | 1 tbsp arrowroot | 1:1; tapioca is slightly chewier in baking |
| 1 tbsp potato starch | 1 tbsp arrowroot | 1:1; potato starch handles higher heat better |
Arrowroot in Gluten-Free Baking
While arrowroot's primary strength is as a thickener, it also appears in gluten-free baking blends. Its role differs from tapioca starch:
- Texture contribution: Arrowroot adds lightness and a slightly soft, delicate crumb. It does not provide the chew that tapioca starch does.
- In flour blends: Typically used at 10-20% of the blend alongside rice flour, tapioca, or sorghum. Higher ratios can make baked goods gummy.
- Cookies and shortbread: Small amounts (1-2 tablespoons per cup of GF flour) improve the tender, melt-in-your-mouth texture of shortbread and butter cookies.
- Paleo and grain-free baking: Arrowroot is popular in paleo recipes as a grain-free starch. It pairs well with almond flour and coconut flour to bind and lighten grain-free baked goods.
When Not to Use Arrowroot
Arrowroot has real limitations that make it the wrong choice in some situations:
- Dairy-based sauces: Arrowroot can make cream sauces and milk-based dishes slimy rather than smooth. Cornstarch or a roux (using GF flour) performs better here.
- Long-cooked dishes: Stews and slow-cooker dishes break down arrowroot over extended cooking times. Add it only in the final minutes, or use potato starch instead.
- High-protein liquids: Egg-thickened dishes like hollandaise do not need arrowroot, and the combination can create an unpleasant texture.
- Deep-frying coatings: Tapioca starch and rice flour produce crispier frying results than arrowroot.
Arrowroot vs. Tapioca vs. Cornstarch: Quick Reference
| Property | Arrowroot | Tapioca | Cornstarch |
|---|---|---|---|
| Clarity when thickened | Clear, glossy | Clear, glossy | Slightly cloudy |
| Acid stability | Good | Poor | Poor |
| Freeze-thaw stability | Good | Poor (stringy) | Poor |
| Dairy sauces | Poor (slimy) | Poor | Excellent |
| Baking chew | Minimal | High | Minimal |
| High-heat cooking | Poor | Poor | Good |
Storage and Sourcing
Arrowroot powder is widely available in natural food stores and online. Common certified gluten-free brands include Bob's Red Mill, Anthony's Goods, and Frontier Co-op. Verify the label for a certified gluten-free designation, as facility cross-contamination is possible with some commodity starch brands.
Stored in an airtight container in a cool, dry place, arrowroot powder keeps indefinitely. It does not absorb moisture or develop off-flavors the way whole-grain flours do, making it a reliable pantry staple.
Always verify that the arrowroot powder product you use is certified gluten-free. While arrowroot is naturally gluten-free, manufacturing facility cross-contamination can be a risk with some brands.