This is one of my favorite food subjects. For portability it's essential to use either a scrambled egg or a broken-yolk fried egg. There are a lot of gradations of broken-yolk fried eggs, ranging from pretty-much-scrambled-on-the-griddle to just-pricked-a-little. I prefer the latter, cooked to the point where the yolk just gels up enough not to be runny. I make one of these sandwiches for our son about three times a week as a breakfast to be eaten on the commute to school. The tradition calls fo