Brightly citrus and white beans make a perfect salad for any season! It's light and refreshing for summer, and a real pick-me-up in winter.
Combine oil, orange juice, and vinegar in a small bowl; whisk to blend.
Season with salt and pepper if desired; mix well. Set aside.
Slice off ends of orange and grapefruit so they can sit flat on work surface. Slice downward around fruit to remove peel and white pith. Slice peeled fruit crosswise into half-inch-thick circles, removing any seeds. Cut grapefruit slices in half. Arrange slices evenly on four serving plates.
Combine spinach and beans in a large bowl; toss to blend.
Drizzle with dressing; toss gently to blend.
Divide spinach mixture evenly among four plates.
The Nutrition Facts box below provides estimated nutritional information for this recipe.