Robin Garr wrote:[I have not tried making foams, but as I understand it, Ferra-style foams are made with liquid, flavors and a gelling agent (gelatin? dunno), foamed by blasting them out of a restaurant whipped-cream dispenser with whatever gas is normally used in those things.
Nitrous oxide (N2O). Aka laughing gas. The commercial spray whipped cream uses this as well. N2O is fat-soluble, so the pressurized gas dissolves in the butterfat of the cream. When you spray it out and suddenly release the pressure, the N2O gas comes out of solution and causes the cream to foam just as it would after a lot of whipping air into it.
It's interesting to note that the only difference between Ferra's foams and Cheez-Whiz (tm) is mainly ingredients, not technique. Plus that with Cheez-Whiz, you're actually getting more for your money. With Ferra's foams, you're paying meagbucks for something that's 99% air.
-Paul W.