If your child's preschool serves lunch but allows outside food, how do you decide whether or not to send a lunch with LO?

Our new PKA (preK) program provides lunch each day, but supplemental food is allowed. I'm torn between just

- Never send a lunch (to encourage DD to try whatever is being offered), and assume she can make do with the sides/snacks if she really doesn't like the main

- Always send a lunch, and know that some of her lunch as well as the some food I send, is regularly getting wasted

- Pick and choose which days to send a lunch based on what I REALLY think she won't eat. In this case, I could opt to include her in the choice or not - the problem is, it's not like she knows what some of the choices are - ie a fish and cheese sandwich is not something she is familiar with, nor can I give her details of what kind of chicken dumpling are being offered (Chinese, or Southern)...so I feel like this could get really complicated!

Regardless of what I do, she will be offered the school lunch - it's just a matter of what I do about sending an extra lunch.

Curious about what others have done - thanks in advance!