# Required ingredients:
→ Base
01 - 6.8 fl oz cold brew coffee, chilled
02 - 6.8 fl oz tonic water, chilled
→ Garnish
03 - Zest of 1 orange (reserve 1 wedge optional)
04 - Ice cubes, as needed
# How to make it:
01 - Fill two serving glasses with ice to chill while assembling ingredients.
02 - Divide the chilled cold brew coffee evenly between the two glasses (about 3.4 fl oz / 100 ml per glass).
03 - Gently top each glass with chilled tonic water (about 3.4 fl oz / 100 ml per glass) to preserve carbonation.
04 - Stir each glass once or twice with a spoon, using a gentle motion to integrate without flattening the tonic.
05 - Express the orange zest over each drink, drop the zest into the glass and add an optional orange wedge to the rim.
06 - Present the drinks cold and sparkling, consuming promptly for best effervescence.