Add gin and coraco, more gin than curaco. Mix the soda, which should have orange flavour (eg. Fanta or something like that) and the tonic, 1/2 of each. Fill up until the bitter gin taste is gone, and the drink is all green. Be sure that all the ingredients are very cold, and add ice. To make it perfect, a slice of lemon is to be slid around the edge of the glass, and then put in the drink.