Guk-ganjang (Korean: 국간장) or soup soy sauce is a type of Korean soy sauce (ganjang) made entirely of fermented soybeans (meju) and brine. It is also a byproduct of doenjang production. Both lighter in colour and saltier than other Korean ganjang varieties, soup soy sauce is used mainly in guk (soup) and namul (a seasoned vegetable dish) in modern Korean cuisine.