Tonka Gin’s signature aroma—vanilla, almond, cinnamon—calls for a tonic that won’t overpower its delicate sweetness but will lift its exotic spice notes. East Imperial Grapefruit Tonic adds bright acidity without bitterness; mango echoes the gin’s tropical fruitiness; crushed tonka beans intensify aroma without grit. Serve in a large glass to allow the botanicals to breathe and always use fresh garnishes.