What are composite vegetables?

The term "composite vegetable" is not a commonly used term in botany or cooking. It's possible you're thinking of one of the following:

* Composite fruits: These are fruits that are formed from multiple flowers that grow together on a single stem. Examples include pineapples, strawberries, and figs.

* Vegetable mixtures: This is a more general term for dishes that combine various vegetables. Examples include stir-fries, salads, or roasted vegetable platters.

* Composite plants: This refers to plants belonging to the Asteraceae family, also known as the sunflower family. These plants have a characteristic flower head that actually consists of many individual flowers grouped together. While some members of this family are vegetables (like artichokes and lettuce), the term "composite" in this context refers to their botanical structure, not a type of vegetable.

If you can provide more context or a specific example, I might be able to understand what you're looking for.