Cost information for the following is not included. Normally this is because the quantity or ingredient is unknown
4 fl. oz. (1/2 cup) grapefruit-infused silver (blanco) tequila (see note below), preferably Partida (or Don Julio Blanco or El Mejor)
1-1/2 fl. oz. (3 tablespoons) St-Germain elderflower liqueur
Club soda
Grapefruit twists or lime wedges, for garnish