Soy sauce
During the 19th century, the southern area of Central Java was developed as sugar plantation, thus sugar mills were built. Next to common sugar, traditional Javanese palm sugar ("gula jawa") were also produced in the region. Soy sauce factory also built in the region, as the result local Javanese developed "kecap manis", which is sweet soy sauce made of a mixture of soy sauce and palm sugar. This sweet soy sauce become the main sauce that combine the savoury "gulai" soup with pieces of goat satay and the fresh crisp of cabbages and tomato.