Rinse and trim beets. Place in a pot of cold water and bring to a boil. Reduce heat to a simmer and cook until fork tender, about 1 hour. 2. Remove beets from water and allow to cool, then peel and dice into bite-sized pieces. 3. Add scallions and mint to beets. 4. In a separate bowl, mix together vinegar, oil, sugar or agave nectar, lime juice, and cumin. 5. Pour over beets, scallions, and mint and toss ingredients to coat evenly. 6. Serve chilled.