Measure the Campari and vermouth in a small old-fashioned glass filled with ice.
Top with the Prosecco, gently stir and garnish with either half an orange slice or a twist of orange (a piece of orange peel).
Notes
Tips For Making The Best Negroni With Prosecco:A Negroni with Prosecco should be served in a small tumbler glass (also known as an old-fashioned glass) over large chunks of ice, also known as “on the rocks”. The bigger the ice chucks, the better because it melts more slowly. Good To Know: You can make a Negroni with prosecco in a flute although an old-fashioned glass is the more popular choice. If you can, chill the glass before making the Negroni Sbagliato but it’s not necessary. A Negroni Sbagliato is most commonly garnished with a slice of orange (either a thin whole round slice or a thin slice cut in half to look like a half moon) or a twist of orange (a piece of just orange peel) directly in the glass and not on the lip of the glass.