Season the scallops with salt and pepper. Heat up a skillet on medium heat and add the butter. Melt the butter, and slowly it will turn into brownish color and start to foam.
Arrange the scallops on the hot skillet and sear on both sides, until they are cooked through.
Add the lemon peel and parsley, serve immediately.
Notes
You may add a splash or two of white wine as you sear the scallops. It's optional.