Lemongrass Parfait with Green Tea Syrup, Mango Wafer Orbs, and Macadamia Nuts

Lemongrass, known botanically as citronella, is a perennial grass, native to tropical parts of Asia, that grows abundantly in warm, humid climates. It has a delicate lemon flavor you may have encountered in savory Asian cooking, especially in recipes from Thailand. Because the lemongrass is used only to impart flavor here and is not an element in the final dish, it is important not to skimp on the time it infuses with the milk. For the same reason, don’t be afraid of adding one or tw