I screwed up and bought a bottle of cherry brandy instead of Kirchwasser.
So I googled what to do with Cherry Brandy, this came up
Cherries from Heaven
1 1/2 oz cherry brandy
1 oz lemon juice
1 dash bitters
4 oz tonic water
Pour the cherry brandy, lemon juice and bitters into a cocktail shaker half-filled with ice cubes, and shake well. Strain into a highball glass almost filled with ice cubes. Top with tonic water, and stir well. Garnish with a lime wedge, and serve.