foil packs we call em. take your foil big enough to seal eyes in foil put butter down slice onions lay them down put walleye filets down more onion slices garlic powder, old bay seasoning, lemon pepper seasoning and lay bacon strips on top seal foil around it all you want a very tight seal so it steams it and the foil pack puffs up about 15 minutes on medium grill make sure not to get a hole in foil till right before serving to let juice and bacon drippings out this great with fresh eyes