1ounceelderflower liqueurSt. Germain, for example.
2ouncesclub soda or seltzer water
1sliceorange or lemon for garnish
1maraschino cherryfor garnish
If you want to layer the gin on top of the Collins, shake the elderflower liqueur and lemon juice in a cocktail shaker with ice. If you do not want a separate gin layer, include the gin with the liqueur and lemon juice.