How to Make a Roux

Steps

1. Melt butter (or fat) in a saucepan and whisk in flour until smooth. Allow it to bubble for at least 1 minute while mixing. 

2. For a blonde roux, allow it to cook a minute or so. For a dark roux, cook the flour/fat mixture longer while whisking, until it reaches a golden dark caramel color.

3. Add cold liquid a little at a time while whisking until smooth after each addition.

4. Add remaining liquid and seasonings, simmer a couple of minutes.