Preheat oven to 250°.
To prepare salmon, sprinkle salmon evenly with 1/2 teaspoon salt and pepper. Place salmon, skin sides down, on a baking sheet coated with cooking spray. Bake at 250° for 30 minutes until fish flakes easily when tested with a fork or until desired degree of doneness.
To prepare rice, rinse with cold water; drain. Combine rice, coconut milk, 1 1/2 cups water, and 1/4 teaspoon salt in a medium saucepan. Bring to a boil over high heat; stir once. Cover, reduce heat, and simmer 20 minutes until liquid is absorbed. Let stand 10 minutes; stir in onions.
To prepare bok choy, heat oil in a large nonstick skillet over medium-high heat. Add bok choy and ginger; sauté 1 minute. Add sake and 1/4 teaspoon salt; cover and cook 2 minutes or until bok choy wilts. Cover and keep warm.
To prepare sauce, combine juice and remaining ingredients, stirring well with a whisk. Serve salmon with rice, bok choy, and sauce.