Pioneers settled the frontiers of North America in the late 18th and 19th centuries. They grew their own food and often gathered wild plants, fruits and hunted animals. A staple food was apple butter, made by boiling apple cider and chunks of apples over an open fire for hours until thickened. It was often cooked communally and stored in crocks for winter. Today apple butter is made similarly in slow cookers. Other common pioneer foods included corn, potatoes, beans and meat like deer, turkey and pork. Cooking was done over open fires fueled by wood or buffalo dung.