1. To marinate the catfish, purie lemon juice, green onions and olive oil in a blender. Pour marinade into a shallow dish and add salt and black pepper to taste. Add catfish fillets, turning to coat. Refrigerate, covered, for 12 to 24 hours to marinate.

Clean and prepare 3 large catfish fillets and season generously with lemon pepper and black pepper. Place the fillets on a clean grill sprayed with pam or another oil to prevent sticking. Grill the fillets until they are firm and cooked through.