01 - Fill two old-fashioned glasses with crushed ice to the rim.
02 - Combine orange juice, pineapple juice, lime juice, orgeat syrup, and simple syrup in a cocktail shaker. Shake vigorously for 10–15 seconds until well-chilled.
03 - Strain the mixture evenly into both ice-filled glasses.
04 - Slowly pour grenadine down the inside of each glass to create a settled red layer at the bottom.
05 - Place an orange slice on the rim of each glass, add a maraschino cherry, and finish with a fresh mint sprig.
06 - Serve immediately with straws and enjoy this refreshing tropical mocktail.