Use the back side of the paddle. Lean forward and hold your elbows up high directly above the [paddle shaft]?. Slap down sharply on the water with a hipsnap? to right the kayak. You will need to slightly roll the paddle forward (i.e. I micro-mini backwards stroke) to cleanly exit the water. Think of rolling your paddle 90* and slicing it up out of the water.
If you have forward momentum, "sliding" the backside of the paddle against the water's surface will give you that extra little bit of leverage. Keep the leading edge of the blade slightly raised so it doesn't dig in. This can be handy when you're not exactly tipping, but don't feel totally steady either--when crossing boat wakes, when turning around to look over your shoulder, or when surprised by a sudden movement of your double partner.
Greenland Paddle Technique
Recovery after a low brace using an extended Greenland paddle is often performed differently than noted above. Rather than slicing the working blade out of the water, the working blade is kept pressed flat against the water, and the paddle, as a unit, is slid over the foredeck (the paddle shaft moving at right angles to the keel). Since the paddle is inclined (the inboard end is higher than the outboard end), this generates lift and keeps the blade in the water should you need to add a scull.