Ed explains it as a cartwheel type maneuver. It is performed like the lomcevak in that you start with one set of controls, then reverse one of them.

INSTRUCTION:
Hold full left rudder, full throttle, full down elevator, full left aileron until the plane goes around about a turn and a half.

Then slide the aileron stick over to the full right aileron position.

The aiplane should cartwheel for a turn or two.