Clabber

Clabber: Clabber was a homemade yogurt-style drink made from sour, unpasteurized milk in the American South derived from the Irish. Now that unpasteurized milk is not readily available, it is rarely made or served.

She laid cold poultices on the child's forehead and fed him clabber.

A Book for Today: Serena by Ron Rash

He sat down clumsily in a wicker chair by the table and waited until she returned, bringing him a plate of sandwiches and a tall glass full of clabber, which he had never tasted before.