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Preheat your oven to 250 degrees. In a large baking pan, spread 5 ponds of all-purpose flour. This does has to be watched and stirred constantly to prevent burning. The process will take about one hour. Let the flour brown to peanut butter color Place this in a large jar or airtight container. The mixture can be refrigerated or simply left in your pantry and will last indefinitely. After you have prepared your seasonings just add the flour to get the desired consistency and voila your roux is ready. I sometimes thicken my gumbo at the end if I don't like the consistency.