Add all ingredients into mixing glass and muddle well. Add ice, shake, and strain into highball glass with ice. Garnish with berries and lemon wedge. * To make juniper berry syrup, add 1 cup water to a small pan and bring to a boil. Add 1 cup granulated sugar, stirring until completely dissolved. Reduce heat and add juniper berries. Simmer for 10-15 minutes. Remove pan from heat and cool.