Using a large knife, carefully peel grapefruits, making sure to remove all of the white pith. Working over a large bowl to catch any juice, cut along the side of each membrane to release the segments and let them drop into the bowl. Add avocados and onion, and toss well. Arrange lettuce leaves on a platter, spoon salad over the top and serve.
Per Serving:230 calories (130 from fat), 15g total fat, 2g saturated fat, 10mg sodium, 25g carbohydrates, (9 g dietary fiber, 12g sugar), 4g protein.
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