Step 1

Place the mint sprigs in a large glass or cocktail shaker, and add the lime juice and rum. Muddle with a muddler or a wooden spoon for several minutes, crushing the mint and releasing its aroma. Add the Campari and a few cubes of ice, and shake or stir until well chilled.

Step 2

Fill a 12-ounce highball glass with crushed ice and squeeze a lime wedge over top. Pour in enough tonic water to fill the glass a quarter full, then pour in the strained Campari mixture. Garnish with a little more tonic water, the second lime wedge, and mint. Best with a straw!