Mixing up a batch of these at home brought to mind the easy drinking qualities of a mimosa as well as the bracingly limey refreshment of a margarita. This is one of those cocktail recipes that should come with a warning—it’s too easy to drink, even for those who aren’t the biggest fans of tequila. The Champagne (or any other dry sparkling wine) rounds out the strong flavors of the tequila and lime, adding bubbles and a wonderfully round flavor that will most likely have you reaching for flute after flute.