Engineering fruits and vegetables in Inventor?
Have you looked through the free sites listed here: http://www.cadtutor.net/forum/showth...Free-3D-Models
If you can't find what you're looking for on those free sites then you're going to have to either build your own models or get out your credit card and take a trip to Turbosquid. I saw a pretty good looking head of lettuce over there for $20. There was also one for $5, but it didn't look quite as good.
I still don't understand why you need a model of lettuce in Inventor though?