Four vegetables that can never be washed clean. Have you ever eaten the last one?

You are probably all very familiar with this vegetable. Its name is lettuce. Lettuce originated from the Mediterranean coast of Europe. It was originally wild, and only later was it cultivated by them. This vegetable is usually just given a quick rinse, because if you try to wash it carefully you will never feel it is clean.

You are probably also very familiar with the second vegetable. Its name is loofah. The editor really likes eating loofah soup; it tastes sweet. However, the outside of the loofah has many small bumps, and after peeling it is slippery, so it always feels like it cannot be washed clean.

The third vegetable is also a common one on people's dining tables. Its name is celtuce leaves. It is generally produced in temperate regions such as China, Japan, and India, and washing it is rather troublesome.

The fourth vegetable can be considered a wild vegetable. Its name is lamb's quarters. Many people pick it to make dumplings, and you also cannot wash it clean, because it is literally called goosefoot!