Plum Gin Fizz

Yields enough puree for 9 drinks - Source 

Plum Gin Fizz

Plum Puree

Ingredients

2 pounds fresh plums, halved and pitted
⅓ cup granulated sugar

Method

Preheat oven to 400°F. Toss together plums and sugar on a large rimmed baking sheet until fully coated; spread in a single layer. Roast in preheated oven until fruit is soft and juicy, about 10 minutes, stirring halfway through roasting time. Let cool 5 minutes. Scrape fruit and any liquid on baking sheet into a food processor or blender; pulse until smooth, 5 to 8 pulses. Pour through a fine wire-mesh strainer into a medium bowl, pressing puree using a rubber spatula. (This may take about 10 minutes.) Discard pulp. Refrigerate, uncovered, until completely cool, about 20 minutes. (You should have about 2 cups plum puree, enough for 9 cocktails.)

Plum puree may be stored in an airtight container in refrigerator up to 1 week.

Cocktail - 1 drink

Ingredients

¼ cup (2 ounces) gin (such as Empress 1908, The Botanist, or Hendrick's Midsummer Solstice)
1 large egg white
1 tablespoon fresh lemon juice
Ice cubes
¼ cup club soda

Method

Combine gin, egg white, lemon juice, and 31/2 tablespoons plum puree in a dry cocktail shaker without ice. Place lid on shaker; shake vigorously to combine, about 15 seconds. Add enough ice to shaker to fill three-fourths of the way up. Place lid on shaker, and shake until well chilled, about 10 seconds. Strain into a chilled highball glass filled with ice. Top with club soda, and garnish with lavender sprig.