Wash all produce thoroughly under cold running water.
Peel the beet and ginger, then cut into pieces compatible with your juicer's feed chute.
Remove the rind from the watermelon and cut the flesh into large cubes.
Alternate feeding the watermelon, beet, ginger, and lemon through the juicer to ensure even mixing.
Stir the collected juice to incorporate any settled solids.
Pour into glasses over ice and garnish with fresh mint leaves.
Serve immediately for maximum nutrient retention.