Puzzle #228: A Quesadilla Cut into Four Pieces

My 4-year-old, like most 4-year-olds, is a pretty picky eater, and there was a phase where a quesadilla cut into four pieces was the one thing he'd reliably eat pretty much any time - hence the title of this puzzle (pdf, puz, pdf solution). This one was, shockingly, rejected by a certain prestigious literary journal, so you get to solve it here instead.