This is a recipe I ran across one day and have loved forever since then!!  It was in the New York Times and it's fabulous!
Crispy Onions
Start with at least a medium onion per person; slice it. Put a splash of oil – doesn’t have to be olive – in a pan. Turn heat medium-high so the onions sizzle when they get in there; salt. Cook, stirring occasionally, until they begin to brown. Lower the heat a bit, but not much. Cook, stirring more frequently, until they are really quite shriveled and dry. Then cook a little more — until black spots begin to appear. Then stop. Total time, around 15 minutes, maybe 20.
Salt them a little more if you like and serve on top of anything