I put my fillets in a ziplock bag with enough Wegmans lemon garlic marinade to cover for 30 mins.
Then grill on a disposable grill pan over charcoal.
They cook fast, maybe 2 minutes per side if fire is hot. Just let the edges get a little char.
Squeeze a little lemon juice on before serving.
Works for walleyes, perch, even bullheads.
So good!