Most if it was vegetables and things I found in the market.

[ He peers into the soup, searching for any sign of said vegetables. There's nothing, though. They seem to have liquefied. Hmm, that definitely is a mark against suitable to feed to living creatures... ]

Oh, but I did have a bit of rock from back home. I thought that might serve as a catalyst.

[ Yep. A rock. A pebble, to be more precise, that just happened to be in his shoe! ]