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Beef soup bones were on sale today, so I thought I’d make a broth )(stock?). I roasted the bones for a couple of hours, then added them to the pot along with some onion, celery, and mushroom stems. As it came to a boil, there was virtually no scum to skim.
The broth is milky white. I can’t seem to get a beef broth with characterstic dark golden brown color that characterizes a French onion soup base.
As suggested by OP in a comment, it is likely that a milky, creamy broth is the result of fat emulsifying into the broth due to too-violently boiling the broth. For context: when making a Tonkotsu ramen broth, this style of milky broth (typically made with pork rather than beef bones) is often the desired result, hence you'll find recipes calling for a sustained rolling boil for hours (whereas traditional French stocks would be kept at a simmer), or even suggestions to blend up your broth.
Thus, the answer to this question would be to cook the broth at a simmer, rather than a rolling boil.
