Take a sling or bamboo or collins glass. 10-12 mint leaves. 20 ml fresh limejuice. 15 ml sugar syrup (2:1 sugar:hot water and cool down) 50 ml light or dark (older) rum.
The ice in a cocktail glass melts mainly because the temperatures of the glass and the ice inside level up. If you put just several ice cubes into the glass, they melt quickly.... more »