Recipe adapted from the What’s Cooking? USDA Mixing Bowl website.
To make dressing, whisk lemon juice, garlic, mustard, oil, salt, and pepper in a large bowl.
Place the sliced beets in a small bowl. Toss 1 tablespoon of the dressing with the beets to coat.
Toss the lettuce and beans with the remaining dressing in the large bowl.
Place onto plates and top with beets.