How-To Make a Roux:
All good gumbos start with roux—a mixture of fat and flour that thickens and flavors the stew.
1. Once fat is melted, stir in flour until a smooth paste is formed. You may need to use a whisk.
2. The roux will bubble and foam as it cooks. It might also look like the fat is separating from the flour, but just keep stirring.
3. The color will change from blond to honey to caramel as it cooks and will smell nutty. Remember, keep stirring.
4. You’re looking for roux that’s the color of peanut butter. You can go darker if you prefer, but the longer a roux is cooked, the less thickening power it has.