What is the primary ingredient of a roux based soup?

Chef's answer
Roux-based soups contain flour (starch) and fat..
Frequently asked Questions 🎓
If I want to get the task done fast, I can put it on a higher heat and stir the whole time, or I can use a lower heat and stir every few minutes." If using a higher heat, choose a fat with a higher smoke point, like vegetable oil (or a mix of butter and oil), to avoid burning the roux.
Roux-based soups contain flour (starch) and fat..
One of the most important keys to building a delicious stock-based clear soup is to: season the soup as you make it. Roux-based soups always contain cream. The stems of hard vegetables should never be used to make a roux-based soup..
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