Can anyone from South Louisiana tell me how to make a gumbo with roux that you buy in a jar?

I am going to attempt to cook a duck, hen, and sausage gumbo for the first time and I’m not really sure how to do it. I’ve been looking for recipes online but all of them include how to make the roux from scratch. I just wanted to use Kary’s Dark Roux. Can anyone tell me how to make the gumbo with the Kary’s roux? Thanks.

All you have to do is put your jar roux in the pan first and start with you ingredients. Usually I make it from scratch, but you can put it in the pan and add the onions, bell pepper, celery and garlic. Sauté until the onions become translucent and the vegetables are tender. Usually we have beef cubes in ours to add flavor. But to answer your question just start out with it in the pan and heat it and go from there.