This is my go-to recipe for an easy entree salad. My French cookbook advises to use Frisee lettuce, but I just use a Mesclun mix. I have yet to find Frisee that has a good flavor, but I have been told that a very white head is superb. I don't measure the amount of white vinegar I use in poaching the eggs, but just add a short "glug." I love the flavor of bacon with all of its glory in the "drippings." But to decrease the amount of animal fat in this recipe, I replace most of the drippings with olive oil and find that I still get all the flavor of the bacon from the browned bits that remain. (The fat in the egg yolk is a very healthy fat) This recipe can serve 2, but usually this is a solo dinner for me.