Demonstration of Native American technique of making <a href="https://en.wikipedia.org/wiki/maple_sugar" class="extiw" title="w:maple sugar">maple sugar</a> - stones are heated in a fire, then placed (using deer antlers for tongs) in a hollowed-out log containing maple sap, which gradually evaporates the water and leaves the sugar.  Demonstration done at the "Maple Harvest Festival", Beaver Meadow Audubon Center, North Java, NY.
<a href="//commons.wikimedia.org/wiki/User:Davepape" title="User:Davepape">Dave Pape</a>
<span class="int-own-work" lang="en">Own work</span>