How to make a roux for sauces?
Beginner roux basics: what it is and how to do it
A roux is the foundational cooked mixture of fat and flour used to thicken sauces and soups. It matters because the way you cook it controls both texture and flavor—so learning it unlocks a lot of classic dishes.
What you need
- Fat (commonly butter or oil)
- Flour (all-purpose is typical)
How it’s made
- Heat the fat in a saucepan over medium heat until it’s melted and smooth.
- Whisk in flour gradually so there are no lumps.
- Cook, whisking, until smooth. This step is where the roux changes: - Light roux (shorter cook time) thickens but stays mild. - Darker roux (longer cook time) becomes deeper in flavor and will tint the sauce.
Why it’s important
Once you have the roux, you can combine it with liquid (like stock or milk) and whisk until thickened. The roux’s thickness comes from flour particles dispersing into the hot fat and then activating as liquid is added.
For beginner cooks, the key takeaway is that a roux isn’t “mystical”—it’s controlled heat + whisking + timing. Start with the simplest fat-and-flour ratio you trust, and focus on keeping the mixture smooth while it cooks. After that, you can confidently use roux as the backbone of gravies, creamy sauces, and many comfort-food staples.