Caribbean Parachute

Combine the light rum, freshly squeezed lime juice, Amaro Montenegro, and simple syrup in a shaker without ice.

Dry shake the mixture to blend the flavors, then add ice and shake thoroughly until the cocktail is chilled and frothy.

Pour chilled tonic water into a highball glass. Strain the cocktail mixture into the glass, allowing the drink to settle about a half-inch below the rim.

Let the foam settle completely, then continue straining the remainder of the cocktail.