1 (8-ounce) carton plain low-fat yogurt |
1/2 cup diced seeded peeled cucumber |
1 tablespoon chopped fresh dill |
2 teaspoons prepared horseradish |
2 teaspoons stone-ground mustard |
1 teaspoon honey |
1 (2-pound) salmon fillet (2 inches thick) |
cooking spray |
1 teaspoon dark sesame oil |
1/2 teaspoon low-sodium soy sauce |
8 green onion tops, split lengthwise |