Best Cornstarch Substitute in Béarnaise Sauce

Arrowroot powder is a starch extracted from tropical plants and is prized for its ability to thicken liquids at lower temperatures, which is ideal for Béarnaise Sauce where gentle heat is crucial to avoid curdling the egg yolks. It produces a clear, shiny finish that maintains the sauce’s elegant appearance.

To use arrowroot powder effectively, mix it with a small amount of cold water to create a slurry before adding it to the warm sauce. Avoid boiling the sauce after adding arrowroot, as prolonged high heat can break down the starch and thin the sauce.

Compared to cornstarch, arrowroot yields a more translucent and less pasty texture, preserving the delicate balance of the sauce’s emulsion and flavor profile.

Rice flour is a fine powder made from milled rice and acts as a gluten-free thickener. It thickens Béarnaise Sauce effectively without imparting strong flavors, but it does not produce the same level of translucency as cornstarch or arrowroot.

To avoid graininess, sift the rice flour and whisk it thoroughly into the sauce at a low temperature. It’s best to add it gradually and cook gently to prevent clumping.

The final sauce may appear slightly more opaque and have a less silky mouthfeel compared to cornstarch-thickened Béarnaise, but it remains a reliable alternative.

Kudzu starch is derived from the root of the kudzu plant and is known for its strong thickening power and clear finish. It behaves similarly to arrowroot, thickening at lower temperatures and maintaining the sauce’s delicate texture.

When using kudzu, dissolve it in cold water before adding to the sauce and avoid boiling to prevent breakdown. It requires careful temperature control to maintain the emulsion.

The resulting Béarnaise Sauce is smooth, glossy, and true to the original texture, making kudzu an excellent albeit less common substitute.

Ground flaxseed forms a gel when mixed with water, acting as a thickening agent. While it can thicken Béarnaise Sauce, it introduces a noticeable flavor and a heavier texture that diverges from the traditional light and silky consistency.

To use, mix ground flaxseed with water to form a gel before gently incorporating it into the sauce. Heat gently to avoid breaking the emulsion.

This substitute is best for those seeking a plant-based thickener but expect a deviation in flavor and texture from the classic Béarnaise.

Glucomannan is a soluble fiber derived from konjac root and is a powerful thickening agent. Its high viscosity means only a small amount is needed to thicken Béarnaise Sauce without heating to high temperatures.

It should be dispersed carefully in cold water before adding to the sauce to avoid clumping. Overuse can result in a gummy or overly thick texture that masks the sauce’s delicate flavors.

When used correctly, it preserves the sauce’s smoothness but may slightly alter mouthfeel compared to cornstarch.