Add pineapples, orange curaçao, orgeat almond syrup, light rum, dark rum, and lime juice to your blender and blend until smooth. Optional: Add ice if you're enjoying this on a hot day so it stay frozen longer. OR serve over crushed ice.
Add grenadine to a 15oz glass, then pour the Mai Tai blend over top to create a layered effect. Stir slightly to blend the grenadine with the mix to create a gradient effect.
Serve in a tiki glass with a slice of lime as a garnish. For hot days, you may want to add crushed ice to your glass to keep your frozen mai tai cold and frosty.