the.com/roux

Butter and flour's marriage, cooked until it stops tasting like paste and starts tasting like promise.

means A cooked mixture of fat and flour used to thicken sauces, soups, and gravies.

from From French roux, meaning 'red' or 'reddish-brown' — the word describes the color the butter and flour mixture turns as it cooks, from pale blond to nutty brown. The term traces back to Latin russus, 'red,' a relative of words like russet. The cooking technique and its name both became fixed in French cuisine, then borrowed wholesale into English kitchens along with the sauces it thickens.

origin
French, literally means russet or reddish-brown
ratio
equal parts fat and flour, by weight
color spectrum
white to dark brown, flavor deepens as fat browns
gumbo rule
darker roux thickens less but tastes richer
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