Hot Honey Grapefruit Soda

If using raspberries:
1 Muddle raspberries in a cocktail shaker or mason jar with a screw-on lid. Add the grapefruit juice and hot honey and fill the shaker 3/4 with ice.
2 Shake until chilled, about 10 seconds. Fine strain the liquid into a highball glass filled with ice.
3 Top with chilled sparkling water and stir gently.
4 Garnish with a grapefruit slice, raspberry, and sprig of mint.
If omitting the raspberries:
1 Fill a highball glass with ice. Pour the grapefruit juice and hot honey syrup over the ice.
2 Stir several times to chill. Top with chilled sparkling water and stir again gently just to combine.
3 Garnish with a grapefruit slice and a sprig of mint.