Season grouper fillet with salt and pepper. I also added some old bay seasoning on one side. Let the fish sit for a few minutes.
Meanwhile heat butter and garlic on the skillet. Add fish and cook for 5 minutes on each side.
Cook fish until done. Take it out and leave on the plate.
Add chopped cilantro to the butter garlic mixture, lemon juice and saute for a minute. The sauce will not be thick but it will be just right to cover grouper... Enjoy it!