Big Batch Option: The Simple Syrup recipe makes enough to use in 10 cocktails with a little leftover. For 10 cocktails, here's the measurements on the other ingredients: 7/8 cup lemon juice, 1 cup king cake simple syrup, 2 cups white rum, 1 cup water. Instead of shaking in a cocktail strainer, mix it together in a cocktail mixing glass or pitcher filled halfway with ice. Strain and chill in the fridge until ready to serve!