Suppose Tammy decides to make onion soup. Which result would be a cost?

 - The onion soup will be tastier than the egg drop soup would have been.
 - Tammy will spend more time making the onion soup than she would have spent making the egg drop soup.
This result is a cost. It involves giving up or spending something that Tammy wants or needs:
Tammy will spend more time making the onion soup than she would have spent making the egg drop soup.