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It's going to help a lot if you give the method you use to make sauce. And maybe describe what is separating from what.
HalfPint is a trusted home cook.
What are you using to thicken the sauce? University of Illinois Extension has a good guide about what to use:
Did you use flour as a thickener? If so, then that's why your sauce separated.
Thank you! That article from Illinois extension was very helpful. And yes I did use four.
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