1. Slice each scallop crosswise into 3 slices. (Leave whole if using bay scallops.) Place in a shallow glass bowl or plate. Add Meyer lemon juice and sea salt. Marinate 5 minutes.
2. Arrange scallops on 4 plates, reserving marinade. Scatter oranges around scallops. Sprinkle with Aleppo pepper and torn mint. Whisk olive oil into reserved marinade; spoon over scallops. Add arugula leaves.