Bayd Makli is the fried egg sandwich in its most literal Lebanese form: an egg fried in oil and put into Arabic bread. Makli means fried, and that single word is the entire specification. The angle is the yolk. A fried egg lives or dies on whether the yolk stays liquid enough to do something, because in this sandwich the yolk is effectively the sauce. Keep it soft and it bleeds into the bread and ties the whole thing together. Cook it solid and you have a dry disk of protein in a wrapper with nothing to bind it.
The build could not be shorter. An egg is fried in oil or butter until the white is set and slightly crisp at the edges and the yolk is still runny or just barely thickened, seasoned with salt and usually a little pepper. It goes straight onto a sheet of thin khubz or into a pita while hot, and the bread is folded or rolled around it so it traps the heat and, when the yolk breaks, soaks it up. That is the dish. Good execution is almost entirely about the fry and the timing: a white with crisp lacy edges, a yolk that is still loose, and a fresh soft bread that bends around the egg and absorbs the yolk without tearing. Sloppy execution overcooks the yolk to a chalky solid so there is nothing to moisten the bread, fries the white hard and rubbery, or wraps it in a stale dry flatbread that cracks and lets the egg fall out the end.
It shifts mostly by yolk doneness and by the small things added alongside. A soft, almost raw yolk makes a rich, deliberately messy sandwich. A medium yolk is tidier and travels better but loses the sauce effect. The usual additions are minimal and chosen to support rather than crowd the egg: a film of olive oil, a slice of tomato, a few sprigs of mint or parsley, a dusting of sumac, a smear of toum for a garlic edge. The moment sausage, preserved lamb, or fried potato joins it, the sandwich becomes one of the named cousins in the egg family, each of which deserves its own article rather than being absorbed here. What bayd makli reliably delivers is the fried egg sandwich stripped to its core: one egg, fried, yolk soft, in bread.