A Fat Free Roux for Soups & Sauces for soups and sauces can be a useful alternative for cooks looking to thicken recipes without traditional butter or oil. Unlike a classic roux, which combines equal parts fat and flour, a fat-free approach typically relies on flour, starch, or other thickening ingredients combined with liquid. Proper technique is important to prevent lumps and achieve a smooth consistency. Whisking the thickener gradually into a cool or room-temperature liquid before adding it to a hot soup or sauce can improve results. Cornstarch, flour, arrowroot, and similar ingredients can produce different textures and levels of gloss. Cooks should consider the recipe’s acidity, cooking temperature, and desired thickness when selecting a thickener. Testing the mixture gradually and adjusting seasoning after thickening can help create a balanced final dish.