Not being sure about the stock, veggies, etc. that you are using??? when I make roux, I usually make
a big batch 3-4 cups oil and of flour. It keeps in the fridge forever, and I always have some for another gumbo or to season other dishes with.
When I was working out of south Texas, Corpus, you can buy quarts in the market.
I actually enjoy the zen thing of cooking it to the right mahogany color and the toast aroma. Sort of like doing the perfect risotto?
A fine place in Galveston uses it in their chicken and dumplings!
Yummm, can't have too much roux,
enjoy,
Nan