What’s the weirdest treat you’ve used training your puppy?

We have the usual training treats and while he’ll eat them and do what we ask when there are treats involved we just found out our hound mix puppy LOVES romaine & red leaf lettuce.
This boy would sell his soul to the devil for a leaf of romaine.
We didn’t intend to give it to him. My son dropped a piece when getting greens out of the mini fridge for our rabbit and now any time that mini fridge gets opened there’s a hound dog sitting nicely waiting for his treat.
So weird.