Final answer:
During the Jōmon period, cooking vessels were made of earthenware pottery, which was constructed using the coil method and decorated with geometric patterns.
Step-by-step explanation:
The cooking vessels from the Jōmon period were made of earthenware pottery. During this period, makers used the coil construction method to build vessels and decorated the exterior with distinctive geometric patterns created by pressing cords against the clay before it was dried, hardened, and fired. These vessels were used for both utilitarian and ceremonial purposes.