Champagne or other white sparkling wine (Hillary uses prosecco )
2 parts Campari (Hillary used 1 ounce)
2 parts Mandarine Napoléon or other orange-flavored liqueur (Hillary used 1 ounce - and often substitutes Cointreau. Grand Marnier could also be swapped in.)
1 part gin (The original called for equal parts Campari, Mandarine, and gin, but Hillary adapted it to use a little less - in this case, about 1/2 ounce)
Not technically a cocktail, but a wonderful summer drink that has the added benefit of being wonderful made without the booze for those who can't imbibe or for evenings when a lot needs to be done.
1 ounce rum, approx 3 ounces spicy ginger beer, 2 generous dashes angostura bitters and 1 tsp lime cordial. Serve over lots of ice with a wedge of lime.
They somehow cut through the humidity and refresh like nothing else.