A day before you want to make the cocktail, make the ginger potion. Put the grated ginger root into the jar. Add the lime zest and juice, cloves, cardamom pods, and sugar.
Using a knife or scissors, split the vanilla bean lengthwise on one side. Open it up, and scrape all the sticky vanilla seeds into the jar. Some of the vanilla will stick to your fingers, so try to get as much of that into the jar. Then throw in the cleaned-out vanilla bean with the rest of the ingredients.
Add the boiling water, let cool slightly, and then close the jar. Let the potion cool in a sunny place if possible, shaking the jar occasionally to mix the ingredients. When cool, transfer the jar to the refrigerator and let the ingredients macerate overnight.
The following day, strain the ginger potion into a pitcher with a top and keep refrigerated. When you’re ready to serve it, add the sparkling, soda, or tonic water.
To mix the cocktail, fill a highball glass to the top with ice cubes. (And if you want to nerd out on ice, check out 52 Martinis’ home hacks and tips for better cocktail ice here.)
Pour in the lime juice (reserve the zest), the ginger potion or beer, and the bitters if using them.
Finally, pour the rum over the other ingredients carefully, to make a layered effect. Some of the rum will seep down into the other ingredients, creating a swirled effect not unlike storm clouds… Voilà, the name of the drink!
Decorate with a sprinkling of the lime zest, lime wheels or wedges for decor and metal or bamboo straws (read here to find out why single-use plastics are being systematically phased out in France since 2021). Bonne dégustation!