Get a marshmallow, put it on a stick, and wait in a forest (preferably National) for a lightning strike.
This is now a natural fire, and when said fire approaches you, hold out the stick till the marshmallow gets ‘just right’. Continue s’more construction, limiting said calories per MooseShell instructions.
Isn’t camping fun? Brought to you by the US Govt.
I came across a S’mores reference the other week. Goes back to the Girl Scouts in the 1920s, iirc.