Ice cream churns the ice cream mixture while cooled inside a household freezer. Some more expensive models have an inbuilt freezing element. A newer method is to add liquid nitrogen to the mixture while stirring it using a spoon or spatula for a few seconds; a similar technique, advocated by Heston Blumenthal as ideal for home cooks, is to add dry ice to the mixture while stirring for a few minutes. Some ice cream recipes call for making a custard, folding in whipped cream, and immediately freezing the mixture. Another method is to use a pre-frozen solution of salt and water, which
Ice cream sandwich shape). The original ice cream sandwich was commonly known as a "cream between". One purchased a small block of ice cream wrapped in paper and placed it between two wafers. The classic Iranian ice cream sandwich is called بستنی نانی means bread-ice cream, and is made with Iranian traditional ice cream in two pieces of wafer. Iranian traditional ice cream usually is made of shaken milk, eggs, sugar, saffron, sa'lab, rose water, or vanilla. In North America, an ice cream sandwich is a slice of ice cream, usually vanilla although other flavors can be used, sandwiched between two rectangular cookie