Pour all of the ingredients, except the vinegar, into a chilled Collins glass. Fill the glass halfway with pebble ice, then swizzle until frosty. Top with more pebble ice, forming a mound above the rim. Pour the vinegar over the surface, then garnish.
Flash-Brewed Mint Tea: Combine 5 grams of loose-leaf mint tea (McLuen uses Smith Tea Single Origin Spearmint) with 1 liter of boiling water in a non-reactive container. Infuse for 1 minute, then strain into a second container holding 2 cups of crushed ice. Bottle for use within 1 week, keeping refrigerated.
