I've been having a great response to a s'mores tartlet lately - graham crust, enriched ganache filling, marshmallows diced on top and torched to order. I like the plain ones, but we also do a "smores-gasbord" with flavored ganaches and marshmallows (like caramel, raspberry, orange). I want to do this at a charity taste of the town event but there are no open flames allowed at the tables, and the hotel refused my request to torch them in their kitchen before serving (can't blame them, what if all 20 restaurants wanted to do that!) - so I am trying to think of another way to melt the marshmallow and I can't. I probably should figure out how long it holds but the event goes for 3 hours so there's no chance I could torch them in the kitchen, pack everything, set up and serve them. I am somewhat tempted to torch them in the truck in the parking lot but I dismissed that idea! Any ideas?