Add all the ingredients to a Highball glass filled with ice and stir.
Garnish with an orange slice.
*Orange blossom soda water: Add 24 oz water, 6 oz orange simple syrup** and 2 oz orange blossom water to a SodaStream (or similar soda maker) container and carbonate.
**Orange simple syrup: Bring 1 cup water and 3/4 cup granulated sugar to a boil, stirring until the sugar dissolves. Add sliced peels from 3 whole oranges, and remove from heat until syrup cools. Transfer to a jar and store in the fridge for up to 2 weeks.