How do you make lemongrass sauce?

To make lemongrass sauce, finely chop 2-3 stalks of fresh lemongrass, discarding the tough outer layers. Sauté the chopped lemongrass in a pan with a tablespoon of oil until fragrant, then add minced garlic and ginger. Pour in coconut milk and a splash of soy sauce or fish sauce, simmering until slightly thickened. Adjust seasoning with lime juice and sugar to taste before serving.