Chop the onions and add them to the beets.
Season with olive oil and vinegar, then add salt to taste.
For best flavor, let the salad rest for about 1 hour before serving.
Note: Eating beets regularly can improve vision, support liver detoxification, and promote colon health. You may notice a change in the color of your urine or stool after eating beets—this is completely normal and is simply due to the natural pigments, which pass through the digestive system without being broken down.