5 Best Arrowroot Powder Substitutes for Tomato Sauce

Quick tip: Use a slurry of cornstarch and cold water to prevent clumping; it thickens quickly and yields a glossy finish.

Cornstarch is a starch derived from corn and is widely used as a thickening agent. It gelatinizes at a similar temperature to arrowroot and creates a clear, glossy sauce which is ideal for tomato sauce where clarity and texture are important.

To use cornstarch effectively, mix it with an equal amount of cold water before adding to the hot sauce to avoid lumps. Cook the sauce just until thickened, as prolonged heating can cause cornstarch-thickened sauces to thin out.

Compared to arrowroot, cornstarch may produce a slightly less delicate texture but maintains a similar appearance and thickening strength, making it the best practical substitute in tomato sauce.

Quick tip: Rice flour thickens more slowly and may produce a slightly grainier texture if not cooked thoroughly.

Rice flour is a finely milled flour from white rice and can act as a thickener in acidic sauces like tomato sauce. It thickens by absorbing liquid and swelling, though it requires longer cooking to fully hydrate and eliminate any raw taste.

When using rice flour, whisk it into the sauce gradually and simmer for several minutes to ensure even thickening and to avoid a gritty mouthfeel. It is less prone to breaking down in acid compared to some starches.

The final sauce may be less glossy and slightly more opaque than with arrowroot, but it remains a good gluten-free option with a neutral flavor.

Quick tip: Kuzu creates a smooth, glossy texture but requires slow, gentle heating to activate properly.

Kuzu starch is a traditional Japanese starch known for its strong thickening properties and ability to create a clear, smooth texture. It works well in acidic environments like tomato sauce without breaking down.

To use kuzu, dissolve it in cold water before adding to the sauce and heat gently while stirring until thickened. Avoid boiling aggressively as it can lose thickening power.

Compared to arrowroot, kuzu provides a similarly clean, shiny finish but can be more expensive and less readily available. It offers a slightly silkier mouthfeel.

Quick tip: Flaxseed adds a slight nutty flavor and can make the sauce somewhat grainy; best used in small amounts.

Ground flaxseed forms a gel-like consistency when mixed with water, which can act as a thickening agent. It is stable in acidic environments and adds dietary fiber and omega-3s.

For tomato sauce, mix ground flaxseed with water to create a gel before stirring it in. Heat gently to incorporate but avoid overheating to prevent bitterness.

While flaxseed thickens effectively, it imparts a noticeable texture and flavor different from arrowroot, making it less neutral but suitable for rustic or whole-food style sauces.

Quick tip: Glucomannan thickens rapidly and requires careful dosing to avoid overly gelatinous texture.

Glucomannan is a soluble dietary fiber derived from konjac root that forms a very viscous gel in water. It is effective at thickening low-pH sauces like tomato sauce without breaking down.

Because it thickens so strongly, use sparingly and add gradually while stirring to control texture. It does not require heat to thicken but can become slimy if overused.

The final sauce will be thicker and more gelatinous than with arrowroot, which may or may not be desirable depending on the recipe style.