Whisk vinegar, oil, salt and pepper in a large bowl. Add romaine, edamame, tomatoes, cucumber, feta, basil, olives and onion; toss to coat.
Tip: In 2016, 94 percent of U.S. soybeans were genetically modified. If you want to avoid genetically modified foods, opt for organic soy products.
2 1/2 fat, 1 1/2 vegetable, 1 lean protein, 1/2 medium-fat protein, 1/2 starch