To prepare salad, alternate tomato and onion slices on a platter. Sprinkle with salt. Top with mint and chives.
To prepare vinaigrette, combine oil, vinegar, mustard, and garlic in a jar. Cover tightly; shake vigorously. Drizzle vinaigrette over salad, and serve at room temperature.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.