01 - In a large bowl, combine minced lemongrass, grated ginger, minced garlic, chopped chilies, soy sauce, fish sauce, brown sugar, lime juice, sesame oil, and black pepper. Whisk thoroughly to create the marinade.
02 - Add the beef cubes to the prepared marinade, ensuring each piece is evenly coated. Cover the bowl and refrigerate for a minimum of 1 hour, or ideally up to 4 hours for a more intense flavor.
03 - If utilizing wooden skewers, submerge them in water for 30 minutes prior to use to prevent charring on the grill.
04 - Thread the marinated beef cubes onto the skewers. Arrange the pieces closely together without overcrowding to ensure even heat exposure.
05 - Set your grill or grill pan to a medium-high heat setting.
06 - Place the assembled skewers on the preheated grill. Cook for 2–3 minutes per side, rotating as needed, for a total of 8–12 minutes until the beef is cooked through and exhibits a desirable caramelization.
07 - Remove the skewers from the heat and allow them to rest for approximately 2 minutes. Serve hot, garnished with fresh cilantro leaves and lime wedges. Jasmine rice can be offered as an accompaniment.