Mix butter, bread crumbs and horseradish in a small bowl until well incorporated. Add bacon and thoroughly combine. Lightly mix in lobster so the pieces don't break up too much.
For Grouper
Place Grouper on a roasting pan, skin side down. Broil on high in the center oven, for approximately 3-4 minutes, depending on the size of the filet. Remove from oven, carefully flip the filet so the flesh side is down. Return to oven and broil another 3 minutes or so.
Remove from the oven and top with the stuffing. Move rack up to the second shelf, return fish to the oven and brown the stuffing. Watch it now very carefully so you don't burn the stuffing.
Notes
Recipe can be reheated, in short bursts in microwave.Will last 2 days in refrigerator.If you have any leftover stuffing, that will freeze well for another use!Do not refreeze fish.