Cappelletti is a great fit for any drink with gin; the two spirits’ herbal elements blend together perfectly. Add dry fino sherry and you’ve got a dry and super-complex base for plenty of citrus. (And with two low-proof elements in here, it’s a reasonably mellow drink that’s great for hot summer days; it won’t knock you out in the afternoon.)
Combine all ingredients except club soda in a cocktail shaker with ice and shake until well-chilled.
Strain into a rocks glass with fresh ice.
Top with one ounce of club soda and stir briefly.
Garnish with a grapefruit triangle.
Contributed by Carey Jones