How to Make It
In a glass or ceramic baking dish, combine the soy sauce with the mirin, sake, lemon slices and jalapeños.
Thread the shrimp onto 8 pairs of bamboo skewers and add them to the marinade, turning to coat. Repeat with the scallops. Refrigerate the seafood for 30 minutes, turning once halfway through, then drain.
Light a grill and oil the grates. Brush the shrimp and scallops with oil and grill over high heat, turning once or twice, until lightly charred, about 4 minutes. Serve right away.