Old Timber

Add all ingredients (except rum) to a single rocks glass and stir to combine. Add ice and stir for 1-2 seconds, just enough to add a slight chill (the drink will continue to chill on its own as it sits). Use a barspoon or small jigger to drizzle overproof rum on top. Express a lemon twist and then discard (you just want the oil from the lemon twist). Garnish with a fresh bundle of mint.