Preheat oven to 375 degrees F. Coat beets lightly with olive oil. Wrap beets in aluminum foil, place on a baking sheet, and roast in the oven until cooked through, approximately 45 to 60 minutes depending on the size of the beets. Remove from the oven, let cool for 10 minutes, and then peel and slice into 1/4-inch thick slices and add to bowl
Slice cleaned radishes thin and add to bowl. Add red onion to bowl.
In a small bowl, mix vinegar, oil, salt and pepper and basil to form dressing. Drizzle dressing on beets and radishes. Serve immediately or refrigerate before serving.
Please keep in mind that nutritional information is a rough estimate and can vary greatly based on the products used.