Not sure what you mean, but maybe try whisking a small amount of flour into it, over very gentle heat. :)
There is a way to temporarily fix a broken beurre blanc. Just take a small amount of heavy cream and reduce it over low-moderate heat. Once its thick you can re-emulsify the broken beurre blanc by slowly whisking it back into the reduced cream. Don't let the sauce get too hot or it will break again. I like to move the pan back and forth off the heat source to regulate the temperature of the sauce. I generally like to hold the sauce in a container placed in a water bath over the stove. That way the sauce is kept over gentle heat.
I've heard you can put it in a blender and just blend it to bring it back together right before you use it.
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