I didn’t get any photos, but the verdict was clear after Saturday night’s impromptu gathering: you totally can make delicious grilled-cheese sandwiches with a flamethrower. Use a soft cheese and keep the slices thin (so it’ll melt quickly), don’t butter the outside of the bread (it catches fire), and smash the sandwich between a couple of cast iron skillets (or use a panini press) if you’d rather not char the outside. 15-20 seconds of heat will do it, but you can go longer if you want the bread to get super crunchy.
Also, don’t assume that those propane cylinders you haven’t touched since last summer are still full.