Seared Ahi with Brown Rice and Pineapple-Ginger Broth

INGREDIENTS

• 2 tablespoons (sweet Japanese rice wine)*
• 1 1/2 teaspoons rice vinegar
• 1 7- to 8-inch sheet dried (kelp)*
• 4 4-ounce tuna steaks
• 1 tablespoon grated peeled fresh ginger
• 7 cups water
• 3/4 teaspoon salt
• 1 teaspoon sugar
• 10 green onions, trimmed, cut into 1-inch lengths
• 1/2 cup dried bonito shavings*
• 5 teaspoons frozen pineapple-orange juice concentrate
• 2 cups freshly cooked brown rice
• 6 teaspoons olive oil
• 4 1/2 teaspoons tamari soy sauce*