Whisk together first 8 ingredients in a small bowl.
Combine romaine lettuce, carrots, grapefruit segments, and sliced onion in a large bowl. Sprinkle with sunflower seeds, if desired. Serve with vinaigrette.
Note: Store remaining vinaigrette in an airtight container in refrigerator up to 1 week.
Note: Nutritional analysis without seeds: Calories 104 (45% from fat); Fat 3g (sat 6g, mono 1g, poly 2g); Protein 3g; Carb 4g; Fiber 2g; Chol 0mg; Iron 7mg; Sodium 209mg; Calc 35mg.
Note: Nutritional analysis below includes sunflower seeds.
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