Mix onion, bread crumbs, lemon zest and juice, sage and thyme together in a small bowl. Add egg white and blend well. Place 3 romaine leaves in bottom of a steamer or enough leaves to cover ...

The cooking time will depend on how thick the fish fillets are, but usually 3–4 minutes on one side and 2 minutes on the other side is just right. The crumb should be golden and the fish cooked ...