Growing Hamburgers

We went to Fudruckers for dinner the other night. Fina gently plucked the seasame seed off the top of the burger and says "Daddy, can we grow hamburgers with this?"
He laughs and says "no. Hamburgers are from cows." She nods "oh yes. That's right. Silly me. Can we grow some big ol' buns!?"

Fina age 6