1. Preheat broiler.
2. To prepare fish, combine the first 6 ingredients in a small bowl, and brush evenly over fish. Arrange fish on a foil-lined baking sheet; broil for 8 minutes or until desired degree of doneness. Sprinkle with sesame seeds.
3. To prepare spinach, while fish broils, heat sesame oil in a large nonstick skillet over medium-high heat. Add garlic and spinach to skillet; cook 30 seconds or until spinach just begins to wilt, tossing mixture constantly. Stir in 2 teaspoons soy sauce.