Don't get too hung up with following the recipe exactly, it is usually made with whatever you have or like.For Instance my husband doesn't like green bell peppers so I use red and yellow instead, Andouille sausage gives me heartburn so I use Beef Polska Keilbasa.Although I have included basic measurements, like any other recipe I make, the measurements are just suggestions tweak them for your personal taste/preference, THE main ingredient should ALWAYS be love.
• Blend flour and oil thoroughly in a thick skillet and cook over medium-high to high heat, stirring CONSTANTLY. BE VERY CAREFUL NOT TO BURN IT!! If you see black specks in the roux, you've screwed it up. Dump it out and start over. Keep cooking and stirring until the roux gets darker and darker. It's best to use a very heavy pot or skillet for roux-making, especially cast iron. With a good cast iron Dutch oven or skillet, you can get a beautiful dark roux in only about 20 minutes.
• You should turn the fire down or off as the roux nears the right color, because the heat from the pan will continue cooking it. You can also add your onions, bell peppers and celery to the roux as it's near the end of cooking to arrest the cooking process and to soften the vegetables (this is the way I like to do it). KEEP STIRRING until the roux is relatively cool.