Authors:

The skin is forming because of proteins, just like if you cook milk or anything else that's got a coagulant protein in it.

"TV Chef Alton Brown Shares Tips On The Science Of Thanksgiving Dinner". "All Things Considered" with Ari Shapiro, www.npr.org. November 24, 2016.
The skin is forming because of proteins, just like if you cook milk or anything else that's got a coagulant protein in it.