Add the St-Germain and mint sprig to a wine glass. Gently muddle, then let sit for 2-3 minutes.
Add ice, pour Prosecco and the sparkling water to top. Stir gently to combine.
Garnish with fresh mint leaves and a slice of lemon.
Notes
The Hugo Spritz is already considered a low-abv cocktail. An option to make it even lower is to omit the Prosecco and use only sparkling water. I love low-abv cocktails for day drinking and times when you want something to sip on without any buzz.
For a fun variation, try a flavored seltzer water like lemon, lime or grapefruit.
More garnish ideas include lime slices, cut strawberries or a grapefruit slice.
To turn this recipe into a pitcher cocktail or punch, use 1 bottle of Prosecco, 3.5 ounces of St-Germain and 6 ounces of sparkling water. This is an easy recipe to batch, but be sure to add the Prosecco and sparkling water just before serving.