Jatjuk (Korean: 잣죽), or pine nut porridge, is a variety of juk (porridge) made by boiling finely ground pine nuts and rice flour in water. It is a mild, nutritious, and easily digestible dish often served to recovering patients and the elderly.

The porridge is made with white rice and pine nuts, which are separately soaked, ground, and sieved. The ground rice is then boiled, with ground pine nuts added a little at a time while simmering. Grinding the ingredients together causes them to separate after boiling. The porridge is seasoned with salt and often garnished with whole or crushed pine nuts.