Warm the honey for 10 seconds in the microwave so it pours easily, then whisk it into the orange and grapefruit juice in a pitcher until no streaks remain.

Cover and chill the juice mixture for 20 minutes.

Fill eight wine glasses with ice.

Stir the chilled juice once, then divide it evenly among the glasses, filling each about two-thirds full.

Top each glass with club soda, pouring slowly so the fizz settles instead of climbing over the rim.

Hang an orange wheel and a grapefruit wheel on the side of each glass and serve right away.