Batak chef and adventurer Rahung Nasution shared this recipe for a fatty marinated pork dish beloved by the Batak tribes of North Sumatra, Indonesia. A simple but flavorful marinade of lemongrass, garlic, lime juice, and soy sauce holds up to high-heat grilling and helps the pork shoulder caramelize beautifully over the hot coals. Nasution pairs the smoky, rich pork with North Sumatran Sambal Andaliman, a powerfully refreshing condiment of green chiles, salt, and andaliman, the juicy green local relative of numbing Szechuan peppercorns, pounded together.