Why cook milk and then remove cream?

In a recipe for a pasta sayce, one of the steps is to cook whole milk for about 20-25 minutes while whisking, then let it cool for 15 minutes, and finally discard the cream "film" that forms on the top. What is the point of doing this? Why couldn't I just use skim milk if I'm going to remove the cream "film" after cooking it?

submitted by /u/WhaleBarnacle
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