1 oz Gin
.5 oz lemon juice
.5 oz grapefruit juice
1 oz Gingersnap Mixer
2 dashes Toasted walnut bitters
Club soda to top
Grapefruit wheel to garnish
Combine all ingredients except the club soda in a shaker with ice
Shake and strain into a Collins glass over ice
Top with Club soda
Garnish with grapefruit wheel