I've seen Pepin use the same concept, but he just holds back some of the mixed egg (maybe 1/3 cup for four eggs?). When they're about done, off the heat and in with the raw egg, and it drops the temp and stops the cooking.I freeze a shot glass of cream, I drop the frozen plug of cream into the eggs when they are to my liking. I then beat it in with the balloon whisk. This reduces the heat enough to stop them cooking on and going grainy. One shot glass to 4 large eggs.So the last mouthful is as creamy as the first.