Make in a 10oz highball (not a 12oz+ Collins) and this is an assertively punchy cocktail with funky rum notes to the fore. And it's all the more delicious...
Agreed. Jasper's 'secret' mix, from Jeff Berry's telling, is 8 oz lime juice, 6 oz sugar, 0.5 oz Ango, and 1/2 a grated nutmeg (for a half recipe). This turns out to be about 1/2 to 3/4 of a tablespoon of nutmeg. Makes ~10 oz of syrup, so more Ango, and LOTS more nutmeg.