Build, fill glass with shaved ice
1 oz fresh lime juice (3 cl, 1/4 gills)
1 1/2 oz Barbados rum (4.5 cl, 3/8 gills)
1 dash Angostura bitters
1/2 tsp sugar (2 dashes)
"Swizzle" until glass frosts
Add lime shell
Serve in a highball glass (9.0 oz)
