Sambals are potent Indonesian condiments packed with chiles. There are different kinds, but the slightly tangy sambal oelek is a blend of hot red chiles, salt, vinegar or tamarind, and sometimes garlic. Other Asian chile pastes are suitable substitutes. It is important to chop the nuts by hand-not in a food processor. Machine-chopped nuts will be overworked and pasty. The dish is so much better when the nuts have a distinct texture.