This easy salad is chock-full of potassium (avocados actually have more potassium than bananas!), fiber, folic acid, vitamin B6, and omega-3 fatty acids. Adapted from the Greens Cookbook, by Deborah Madison (Broadway Books, 2001).
Place the lettuce and spinach (or radicchio) in a large salad bowl. Holding the grapefruit over a separate bowl to catch the juice (save for the vinaigrette), remove the membrane from each section. Add the grapefruit, avocado, and nuts to the greens. Combine vinaigrette ingredients in a jar with a tight lid, and shake vigorously until mixed. Drizzle a little vinaigrette over the salad, toss to coat lightly, and serve immediately.