- Whisk together pineapple juice, soy sauce, brown sugar, Dijon mustard and garlic in a bowl until brown sugar is mostly dissolved. Slice salmon into 1-inch cubes. Pour half of the marinade over salmon cubes in a shallow dish or large zip top bag and gently stir to coat. Marinate for 30 minutes.
- While salmon marinates, place 6 wooden skewers in a shallow dish of water. This will help prevent burning while cooking. Whisk together remaining marinade in a saucepan. Heat over medium-low heat and bring to a simmer. Simmer for 4-5 minutes to reduce slightly.
- Slide marinated salmon on wooden skewers. Discard marinade. Heat grill or grill pan over medium-high heat and grease with cooking oil. Once very hot, grill kabobs for 7-8 minutes, turning occasionally for even cooking.
- Brush salmon kabobs with remaining sauce right before serving and top with sesame seeds and green onion.