Place 1 large ice cube in a rocks glass.

Combine the orange juice, grapefruit juice and pomegranate molasses in a mixing glass with ice and stir for 15 seconds, until well chilled.

Strain over the large ice cube in the rocks glass.

Top with the club soda.

Twist a strip of orange peel over the glass to release its oil, then drop it in.

Serve immediately, while the twist's oil is still fragrant on the surface.