What are some common onion varieties used in cooking?
Common onions used in cooking are yellow onion, white onion, red onion, sweet onion, green onion, spring onion, leeks, and shallots.
Instruction: What are some common onion varieties used in cooking?
Context: 
Response: Common onions used in cooking are yellow onion, white onion, red onion, sweet onion, green onion, spring onion, leeks, and shallots.