To allow small children to help, combine first 7 ingredients in a jar; cover tightly, and let them shake jar vigorously.
Whisk together first 7 ingredients; chill 1 hour.
Arrange lettuce evenly on 4 salad plates. Top evenly with grapefruit and orange sections and sliced onion. Drizzle with dressing.
Find recipes with ingredients that you have on hand.