Take a FEW oranges camping
Campfire cake cooked in campfire. Cut off the top of you orange, ream it out to eat later. Fill up hollowed out orange rind a little over half way with cake mix put the top of the orange (lid) back on, wrap in foil, set in coals about 20 min to bake.
Walla, you've got a cake in a cup to serve an enjoy.
See photo down in the first comment section.