When ready to sauté scallops, heat the oil and 1 tablespoon of the butter in a medium, heavy skillet set over medium high heat. When quite hot but not smoking, add the scallops and sauté until golden on the undersides, about 3 minutes or more. Turn and cook until golden on the other sides, about 3 minutes more. Remove scallops from the skillet, salt them and cover loosely with foil to keep warm.
Pour the orange mixture into the skillet and bring to a gentle boil. Dice the remaining 2 tablespoons butter and whisk it in. Stir in the vinegar. Cook over high heat until the sauce has reduced by a third, 5 or more minutes. Sauce will not be thick, but will have intensified in flavor. Season sauce with salt if needed. Return the scallops to the pan and cook 1 minute more in the sauce.
To serve, ladle sauce over the scallops and garnish with julienned orange peel, and, if desired, chives or parsley.
Nutrition information per serving:
Calories199Fat13 gSodium125 mg
Carbohydrates8 gSaturated fat6 gCalcium68 mg