What does the vegetable basket mean?

Vegetable basket: The "vegetable basket" project is an important measure to alleviate the shortage of non-staple food supply in China. The Ministry of Agriculture (Ministry of Agriculture and Rural Affairs) proposed to build a "vegetable basket" project in 1988. The first phase of the project has established central and local production bases for eggs, milk, meat, aquatic products and vegetables, as well as improved seed breeding and feed processing service systems to ensure that residents can eat fresh vegetables all year round.

The word "food basket" often appears in news about food supply security. For example:

Stabilize the "vegetable basket" ...

Safeguard the people's "vegetable basket" ...

Pay close attention to the "vegetable basket" project …

Protecting the "vegetable basket" of ordinary people ...