Shake the tequila, juices, honey, and bitters in a shaker WITHOUT ice. The purpose of this is to mix in the honey. Let it sit for a minute and then shake again.
Next, add ice and shake until cold, then pour straight up in a coupe-style glass. Add a splash of Prosecco to lighten it up and serve! Garnish the glass with a sugar rim and the cocktail with a small cube of honeycomb (both are optional).