Grilled catfish 1 2 med catffish filets 1 summer squash 1 med onion 1 celery stalk lemon pepper seasoning salt garlic powder Steps on how to grill catfish Place fish on heavy foil add half of squash half of onion season wrap in foil sealing tight place on grill for 20 min. check by sticking fork through foil to test tenderness of squash