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Like most Indonesian dishes, you do need quite a bit of spices and herbs to make gudeg. Must haves include: palm sugar, coriander powder, candlenuts (or macadamia), galangal, kaffir lime leaves, lemongrass, coconut milk, shallot (or onion), garlic, and salt. Traditionally, we also add daun salam (Indonesian bay leaves) daun jati (teak leaves), which can be difficult to procure outside Indonesia. Most people substitute the daun jati with teabags, shallot leaves, or simply omit this ingredient. As for daun salam, it is best to just omit if you cannot find any.