# How To Make It:
01 - Place two serving glasses in the refrigerator or fill them with ice to chill briefly while assembling components.
02 - Divide ice cubes evenly between the two chilled glasses so each is adequately filled.
03 - Pour 3.4 fl oz cold brew coffee into each glass, measured carefully for balance.
04 - Gently pour 3.4 fl oz chilled tonic water over the back of a spoon into each glass to preserve effervescence.
05 - Stir each glass once or twice with a spoon using minimal agitation to blend without flattening the tonic.
06 - Express orange zest over each drink to release oils, garnish with the zest and an optional wedge, and serve immediately while cold and sparkling.