Step 1
In a medium saucepan, combine unsweetened coconut milk, sugar, lemongrass, ginger, lemongrass, Tianjin chiles and teaspoon salt. Cook over moderate heat until simmering, 2 to 3 minutes. Remove from the heat and add makrut lime leaves. Let cool, transfer to a jar and refrigerate overnight. Strain through a cheesecloth-lined sieve into another jar and refrigerate for up to 1 week.
Step 2
In a cocktail shaker, combine the Coconut Mix, pineapple juice and lime juice. Fill the shaker with ice and shake well. Strain into 2 chilled tea cups and add a few ice cubes. Garnish with cayenne pepper.