This is a perfect lunch for when you're rushed and hungry but do not want to eat something greasy/overly filling/time consuming. This lunch literally took 5 minutes to get to my plate. I cooked the egg on low over some olive oil and covered the pan with a lid. This helps the top of the whites to cook through without overing cooking the yolk. Simultaneously I chopped several thick slices of tomatoes and a couple slices of fresh mozzarella. I layered this on top of a bed of arugula, added the egg and lunch was served!
One quick thing, I recommend liberally salting both your tomatoes and your finished egg. Egg yolk is very rich and find that salt really helps to balance out the richness. I also added some fresh pepper and a sprinkle of paprika for color and flavor.
The best thing about serving an egg on top of a salad is that it provides an instant dressing. It may sound like an odd mixture but it truly is divine.