For a milder flavor, remove the seeds and membranes from the chili pepper before chopping. If you don't have a mortar and pestle, you can use a food processor to make the lemongrass paste. Pulse until finely chopped, but be careful not to over-process it into a puree. Soaking the bamboo skewers in water prevents them from burning on the grill. If you don't have time to soak them, you can wrap the exposed ends of the skewers in aluminum foil. To ensure even cooking, cut the chicken strips into uniform sizes. The longer the chicken marinates, the more flavorful it will become. However, avoid marinating for longer than 4 hours, as the acidity in the marinade can start to break down the chicken fibers and make it mushy. Grilled lemongrass chicken is best served immediately while it's still warm and juicy. However, leftovers can be stored in an airtight container in the refrigerator for up to 3 days.