This sambal is actually mum's version. You can replace the french onion (bawang bakung) with bombay onion (bawang merah besar) or shallots (bawang merah biasa). Can be prepared the day before you make your nasi lemak.
Sambal is a condiment or sauce that's highly valued and used daily in Indonesia. It's generally more or less pedis, which means hot as in spicy;