Add the sugar and lime wedges to the bottom of a double old-fashioned or similarly sized heavy bottom rocks glass.Use a long handled cocktail muddle or the wrong end of the wooden spoon to crush the limes until the juice is extracted and the rinds are bruised.Leave all the pulp, rinds and sugary juice in the glass; fill the glass to heaping with cracked ice.
Pour the guaro over the ice; top with a splash of club soda, to taste.
Garnish with mint sprig; serve with a straw for stirring and sipping.Note: White rum or cachaça cane spirit can be substituted for guaro.
