Preheat grill to high. Blend the BBQ sauce with the lemon juice and dill. Reserve.
Toss the pepper with the lemon zest.
Pat the scallops dry with paper towels. Remove and discard the knob shaped muscle on the side of each scallop. Brush each scallop with butter and sprinkle evenly with salt. Place on the grate and cook for 1 minute or until the scallops release easily when lifted with the tongs.
Brush each scallop all over with the reserved BBQ sauce mixture. Sprinkle the topside of each scallop with the reserved pepper mixture and grill 2 minutes longer or until the scallops remove easily from the grate.