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Place watermelon cubes into a large bowl.
In a small bowl, whisk lime juice, honey, sugar, and salt until combined.
Pour the mixture over the watermelon and gently toss.
Sprinkle chili powder, cayenne, and Tajín over the top.
Toss lightly again to coat evenly.
Chill in the refrigerator for at least 30 minutes.
Garnish with fresh mint before serving.
Serve cold for a crisp, juicy, sweet-heat bite.