Is there a way to scramble an egg inside its shell without using an external dish? E.g. delicately puncture the shell with a needle of sorts, penetrate the yolk and shake it while keeping the hole plugged with a finger.
I have a favorite Asian soup that I like to twist with a dropped egg at the time of reheating. I do go out camping a lot and it would be nice to spare a dish while fixing the soup on the tailgate of my truck.
Alternatively, is it viable to drop an unscrambled egg in the soup and scramble it in the short amount of time before it cooks?