Apple Foam
Make first: Demerara Syrup
Uses pressurised equipmentThis calls for a whipping siphon or a carbonating bottle. Both hold real pressure: use only a vessel rated for it, never overfill it, never exceed the charges the manufacturer specifies, keep it out of heat, and release the pressure fully before you open it. Follow the instructions that came with your equipment over the ones in any recipe, including this one.
Method
Place 14 oz apple juice, ⅛ oz egg white powder, and 2 teaspoons Demerara Syrup in a whipping gun and use 1 charge to whip until the mixture is foamy.