Kiwi Cooler

1 ripe kiwi, peeled and cut in half
18 fresh tarragon leaves
1 1/2 ounces Mischief Gin
3/4 ounce fresh lime juice, from 1 large lime
1/2 ounce simple syrup
3 ounces chilled seltzer
Garnish: tarragon sprig

Add kiwi and tarragon to mixing glass and muddle until kiwi is liquified, about 30 seconds. Add gin, lime, and simple syrup. Fill mixing glass with ice and shake until well chilled, about 30 seconds. Strain into ice-filled glass, top with seltzer and stir gently before serving, garnished with a tarragon sprig.