Combine 1 sm cantaloupe, diced, ½ red chile pepper, seeded and chopped, 10 fresh basil leaves cut into strips, 2 tbsp olive oil, 2 tbsp fresh lime juice, pinch of salt, and a pinch sugar in a bowl. Heat 2 tbsp olive oil in a skillet. Season tuna steaks with salt and pepper. Cook tuna in oil for 3 minutes per side. Spoon cantaloupe mixture over each steak to serve.