Combine all but sesame seeds and salmon in a saucepan. Bring to boil and slowly simmer until a syrupy consistency is achieved, about a 50 percent reduction. Let cool completely.
Add sesame seeds and salmon and marinate for 1 hour. Remove salmon from marinade and bring sauce to a boil. On a hot grill, cook salmon for about 3 to 5 minutes per side. Occasionally, brush the salmon with the teriyaki sauce.
MIRIN CUCUMBER SALAD:
1/2 tablespoon wasabi powder
1 tablespoon mirin
1 tablespoon rice wine vinegar
1 teaspoon sugar
1/2 cup canola oil
Salt and white pepper to taste
2 large English cucumbers, julienned
Sesame seeds, for garnish