Making a Hugo is relatively simple. It just takes Sparkling Wine, Mint, and Elderflower Syrup. If you like, you can add a spritz of lemon or lime. And some people like to make it even less alcoholic by adding some sparkling water. I'll give you the basic Hugo drink recipe, and you can try it at home. My only suggestion is to not go too heavy on the Elderflower Syrup... or the drink gets too sweet, and loses its refreshing qualities.
Put the Mint leaves and a ice cubes in a glass. (Traditionally, the drink is served in a wine glass, but I used a regular glass)Muddle the mint with the ice.... (Muddle means to crush it a bit so that the aroma is released... you don't need to mangle the leaves, just crush. Use a spoon or a muddling tool)
Add the Elderflower Syrup (or if you are looking for an alcoholic BOOST, add St. Germain liqueur)
Add the Prosecco or Sparkling Wine.
Squeeze a lemon slice over the drink and serve.
Notes
You can lesson the alcohol by replacing half of the sparkling wine with sparkling water.