Baby Beet Salad

4 (14 ounce) cans baby beets - drained, rinsed, and quartered

2 (15.5 ounce) cans mandarin oranges, drained

1 large purple onion, cut into chunks

2 cups apple cider vinegar

2 cups orange juice

Stir the beets, oranges, onion, vinegar, and orange juice together in a bowl; serve immediately or chill until needed.