You can roll the Slow Stick too. Make sure you have as much rudder throw as possible, then get up pretty high so you can recover if necessary. I don't want the dead carcass of an airplane on my conscience

Start out by bringing the nose up slightly, then give it full left rudder. As the plane goes inverted, jam in some down elevator, and the plane will roll right over. That's DOWN elevator, forward on the right stick, just so there's no confusion.

Aborting the maneuver is simple if you're high enough. Let go of the rudder and pull back gently on the elevator stick. Depending on where you are in the roll, you'll either end up flying upright and level, or you'll end up in a tight turn.