Immerse yourself in a harmonious blend of Japanese and Caribbean influences with the Citrus Zen Garden cocktail. This refreshing and slightly spicy concoction combines the crispness of sake with the tropical punch of rum, elevated by the zesty flavors of grapefruit, lime, and the effervescence of tonic and ginger beer. 

Ingredients:
- 1 oz Sake
- 1 oz Rum (preferably white for a lighter touch)
- 2 oz Fresh grapefruit juice (jus de pamplemousse)
- 1/2 oz Fresh lime juice (jus de citron vert)
- 2 oz Ginger beer
- 1 oz Tonic water
- Grapefruit slice and lime wheel for garnish
- Ice cubes

Glass:
- Highball glass

Instructions:
1. Fill your highball glass with ice cubes to chill.
2. Pour in the sake and rum, laying the foundation with these divergent yet harmonious spirits.
3. Add the fresh grapefruit juice and lime juice, enveloping the spirits in a burst of citrus.
4. Top up the glass with equal parts ginger beer and tonic water, offering a nuanced fizz and a hint of spice.
5. Gently stir the mixture to blend the flavors while retaining the effervescence.
6. Garnish with a slice of grapefruit and a wheel of lime, invoking the aesthetics of a Zen garden.
7. Serve immediately and enjoy the refreshing, multi-layered flavors of the Citrus Zen Garden cocktail.