When were kitchen sinks invented?

Not long after we invented fire.

The very first cooking pots would have been big, tough leaves, like banana leaves.

Later, they were made out of clay and or thickly woven baskets.

Ancient civilizations have always used pots of some form. Native Americans used baskets with tar inside and they could put hot rocks in them to get hot water. The ancient Chinese used pots for many things as well as cooking so did the Egyptians. Pots or baskets can be traced back to over 5,000 years ago.