Heat grill to medium high heat. Oil grill. Place lemons on the grill, cut side down. Grill for 1-2 minutes. Turn lemons a quarter turn with a spatula (do not use a tong, it will break the seared lemon and release its juices), keeping it face down. Grill another 1-2 minutes. Set to the side. Garnish salad with 2 lemon halves per plate. Let guests squeeze grilled lemons over their seared scallops.
*The grilling sears in the juices of the lemon and brings out an intense sweet flavor.