Lay the tortilla on melted butter in a large cast iron skillet over
Cover one-half of the flour tortilla with the peach. Top with jalapeno
slices, then sprinkle Monterey jack cheese or mild white cheese
over the top. Sprinkle red onions over the top of the cheese. Flip
the unfilled side of the tortilla over the filled side. (You will
have a half circle.)
Grill until one side is browned to your liking, then flip and grill
the other side. Quesadilla is ready when cheese is melted.