Here's Don all geared up for the grill - notice the requisite beer? He cannot grill anything without a couple beers to keep him company.
1/4 cup melted butter
1/4 cup Worcestershire sauce
1/4 cup lime juice
four to six bonito fillets
Mix melted butter, Worcestershire, and lime juice in a gallon-sized zip bag. Add fillets, and marinate at least 4 hours. Remove fish from bag and grill in a grill basket until done (about 10 minutes on each side).