Measure out all your liquids: orange juice, pineapple juice, regular rum, coconut-flavored rum, and grenadine. Use fresh juice if possible for a brighter flavor, but bottled works fine in a pinch.

In your blender, combine the crushed ice with all the measured liquids. No need to layer—just toss it all in.

Blend on high until the consistency becomes smooth and icy, like a frozen cocktail or slushie. Takes about 20–30 seconds. If the mix looks too thin, add a little more crushed ice. Too thick? A splash more juice will fix it.

Pour the Bahama Mama into your glass of choice. For a festive touch, garnish with a pineapple wedge, maraschino cherry, or even a tiny umbrella.