Add mint leaves and simple syrup to a highball glass. Muddle gently to release aroma.
Fill the glass with ice.
Add Midori, rum, and lime juice. Stir to combine.
Top with soda water and stir gently.
Garnish with a mint sprig and lime wheel.
Notes
Use extra mint for stronger aroma. Add more lime for a tarter drink, or more Midori for sweeter melon flavor. Serve with crushed ice for a classic mojito feel.