gill-man grog

1 oz Dark Jamaican Rum (Coruba)
1 oz Aged Demerara Rum (El Dorado 5 Year)
1 oz Light Rum (Santa Teresa Claro)
3/4 oz Lime Juice
1/2 oz White Grapefruit Juice (3/4 oz Pink)
1/2 oz Maple Syrup
1/2 oz Falernum (Velvet)
2 hard dash Allspice Dram (2/3 bsp Hamilton's)

Shake with ice, strain into a double old fashioned glass with a Navy Grog ice cone, and top with 1 oz soda water.
Two Fridays ago, I spotted a reference to the Gill-Man Grog on Reddit, and I hunted down the recipe on The Atomic Grog blog. There, they provided the history that it was created by Jim Masterson for the 2013 Hukilau event in Fort Lauderdale and named after the old measure for 4 ounces a/k/a the gill. The combination of rums, grapefruit, lime, and maple syrup reminded me of Don the Beachcomber's Volcano Bowl but with two spice elements in the mix. Despite a crack in my Navy Grog ice cone, I continued on to prepare the drink which began with a dark rum, maple, and allspice aroma. Next, a carbonated caramel, lime, and grapefruit sip fled into dark rum with a hint of funk, maple, allspice, ginger, and clove flavors on the swallow.