Alton Brown has an episode of Good Eats, (Season 11, Episode 12, “Puff the Magic Mallow”) where he describes making marshmallows. It’s an involved process that requires boiling a sugar syrup to the “soft ball” stage then whipping the hot sugar syrup into gelatin, and continuing to whip as the mixture cools and the gel sets with lots of air lofted in… The final product is super-duper sticky… it took Pidi about 6 minutes to lick a smear off the floor. Go ahead and follow his recipe… I cut my marshmallows into squares.
Once the marshmallows were set and cut… S’mores!
Start the broiler preheating. Arrange the rack about 6″ below the heating element.
Line a cookie sheet with parchment. Arrange 2 graham cracker squares per person. Take the marshmallows and tear in half lengthwise, exposing the sticky inner surfaces. Stick marshmallows to the graham cracker. Cut chocolate into small, irregular pieces – about 1 cm on each side. Stick into the marshmallow at odd angles, leaving marshmallow exposed.
Broil for 1-3 minutes, depending on the heat of your broiler and your preference for toasted or burnt marshmallows. Since these are cooking via the direct heat of the broiler element, you can leave the oven door open an inch and watch the cooking, so you can remove the s’mores when they’re done to your liking.
Once they’re out of the oven, let them rest for a minute or two (if you can wait that long) to set up. Eat them open-faced, or press two graham crackers together to make a more traditional “sandwich” style s’more.