Step 1

Place golden beets in a medium saucepan, and baby beets in a small saucepan; add water to cover beets by 2 inches. Bring to a boil over medium-high heat, then reduce heat to medium-low; simmer until beets are tender, 40 to 45 minutes for golden beets and 15 to 20 minutes for baby beets. Drain beets, and let stand until cool enough to handle.

Step 2

Peel beets. Cut the golden beets crosswise into 1/4-inch-thick slices, and cut baby beets in half lengthwise. Arrange beets on a serving platter.

Step 3

Whisk together the orange juice, lemon juice, and oil in a small bowl. Season with salt and pepper, and stir in the mint. Drizzle beets with the citrus-mint dressing, and garnish with mint sprigs.