U.S. patent application 20190053514 (applicant Sigma Phase Corp., Concord, Mass.):
"A system for providing a single serving of a frozen confection, wherein the system comprises a pod [910, right] comprising at least one ingredient for providing a single serving of a frozen confection; the system cools the pod; the system introduces water into the pod; the system simultaneously stirs the contents of the pod while scraping at least one wall of the pod to prevent a build-up of the frozen confection on the at least one wall of the pod; and the system ejects the frozen confection out of the pod. ... In one preferred form of the invention, at least one container holding a eutectic solution  is disposed adjacent to the pod seat of nest. This eutectic solution is used to store “cold” at the nest. More particularly, coolant unit is used to cool the eutectic solution to the point of freezing, and then the eutectic solution absorbs heat from pod 910, whereby to produce the frozen confection."