Brew the tea and set aside.*
Place some ice in a rocks glass or similar sized glass.
In a cocktail shaker, muddle the orange slice and sugar together until the sugar is mostly dissolved and the orange has been flattened and released its juices.
Add the tea and shrub and top with ice.
Shake well, until the shaker is very cold and is sweating.
Strain into the prepared glass, top with club soda and garnish. You can garnish with an orange wedge or slice and edible flowers if desired.