Bar Code Tonic | Saveur

Ingredients

• 1½ cups sugar
• 1 tbsp. citric acid
• ½ tsp. kosher salt
• 1 (750-ml.) bottle dry gin
• 1 cup 190-proof Everclear
• 1 tbsp. cinchona bark powder
• 1 tbsp. grated grapefruit zest
• 1 tbsp. grated lemon zest
• 1 tbsp. grated lime zest, plus wedge for garnish
• 1 tsp. grated orange zest
• ¼ tsp. whole allspice, crushed
• 8 fresh or frozen kaffir lime leaves, chopped
• ¼ stalk lemongrass, chopped
• 4 oz. club soda