From The Boundary Waters: Hudson Bay Bread

The only item on the lunch menu the first day was a three-inch square of Hudson Bay Bread gobbed with about two tablespoons of peanut butter. I’d worked up quite an appetite paddling and portaging that morning, and privately wondered where I’d get the energy to last the rest of the day.
To my surprise, the Hudson Bay bread was so rich, filling and full of calories
that I could barely finish it. I had ample energy to paddle, portage and hike until that evening. That was lunch for several days, and Hudson Bay Bread fueled many rigorous miles of paddling and portaging!
If you are outside in cold weather, doing vigorous activities, you'll like this recipe!