- Thread pepper, onion, pineapple and tuna onto 8-inch skewers. Brush with half of Takumi sauce.
- Preheat outdoor grill to medium heat (350-400ºF) or heat a grill pan over medium-high heat and lightly grease with cooking oil. Grill tuna kabobs for 8-9 minutes, turning every 2-3 minutes. It’s okay if the tuna remains slightly pink on the inside.
- Remove from grill and brush with remaining Takumi sauce. Serve hot, garnished with green onion.