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Cranberries contain a massive amount of natural pectins. They will gel all on their own, which is why you can basically make cranberry sauce out of filling.

"TV Chef Alton Brown Shares Tips On The Science Of Thanksgiving Dinner". "All Things Considered" with Ari Shapiro, www.npr.org. November 24, 2016.
Cranberries contain a massive amount of natural pectins. They will gel all on their own, which is why you can basically make cranberry sauce out of filling.