Olchaengi guksu are traditional South Korean noodles that are especially popular in Gangwon province. The noodles are made with a combination of dried corn kernels and water. The corn kernels are placed in a stone grinder and heated in water over medium heat in order to turn into starchy water that looks like a thick corn porridge.
The mixture is placed into a large bowl with holes at the bottom, and the bowl is placed over a large pot of boiling water so that the noodles drip from the holes (similar to the German spätzle) and form noodles that look like tadpoles, hence the other name, tadpole noodles.