How can I thicken a sauce without flour or cornstarch?

Online Answer
Puree some vegetables. Starchy vegetables—like potatoes, winter squash or celeriac—are excellent thickening agents, especially if they've been pureed. Simply roast or boil these vegetables and pop them into the food processor until smooth.
Related Questions 📌
Much like cornstarch, potato starch is used to thicken soups, sauces and pie fillings. It's also an essential part of gluten free baking. ... If potato starch is added to a dish that is too hot, it can cause the molecules in the starch to break down and not absorb moisture correctly.
The most common option is adding tomato paste. You can also use starch like flour, cornstarch, or roux. Or add some mashed potatoes or arrowroot. My go-to way of fixing a watery spaghetti sauce is to let it reduce by cooking it a little more.
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    Wheat flour is the thickening agent to make a roux. A roux is a mixture of flour and fat and is a classic way to thicken soups, gravies, and sauces like bechamel or stews like gumbo. Equal parts of wheat flour and typically butter are cooked in a heated vessel, forming different colored pastes depending on use.
    Starch is composed of thousands of sugar molecules that are oftentimes found in grains like wheat and corn or roots like potatoes and arrowroot. Starches also require heat in order to help thicken recipes. ... Vegetable gums (guar gum and xanthan gum) and proteins (gelatin) are also options for thickening up your recipes..