Place the first 5 ingredients in a bowl and whisk to combine. Add the remaining ingredients and toss to coat. Spoon the salad into a serving dish and serve immediately.
Note: The juice required for this recipe can be obtained by squeezing the grapefruit pulp after segmenting. To learn how to segment a grapefruit, look for this recipe at thriftyfoods.com and click on the cooking tip next to it.