<human>:  How do I make a roux?
<bot>: To make a roux, start by melting equal parts of butter and flour in a skillet over medium heat. Stir with a wooden spoon or whisk until the butter and flour are combined and lightly toasted. Let the roux cook for a few minutes, stirring continuously to prevent burning. Once the roux has achieved the desired color, you can add it to your recipe.