Growing pizza!!

I went out to water (fertilize) my plants this morning and the kids stood at the window watching. When I came inside my 4 year old son asked what the green stuff was. I explained it was fertilizer for the plants....it's their food. I don't recall every word that came out of his mouth, but he eventually asked if we could grow pizza!! I told him we can't grow pizza, but that was a nice thought! LOL!!