Castro Cooler is rich average cocktail at 1 standard drinks. Built with 30ml rum gold amber bacardi and 15ml elderflower syrup muhlebach with 15ml lime juice as well as 40ml lime soda including 190ml ice and best with lunch. Just spiral cut the peel of a whole lime then run lime peel around rim of glass and hold part of peel outside glass. Add ice and pour gold rum over ice and add sugar syrup then top with lime soda and served in a highball glass cold.