[cough sputter], the website uses cornmeal muffin mix among other flours..., sorry for all you folks wanting to re-create an original dish or item to see how it really tasted..., muffin mix has baking powder, and baking powder or baking soda are leavening agents that are a 19th century item.
Mixing nuts or berries into them might taste good when done, but don't do that for trail rations if you want them to last more than a few days unless you use lots of salt. Nut meats and berries will mold quickly without salt. Wheat flour when milled as they did in the 18th century will also go rancid as they didn't remove the germ, and rye flour will sometimes grow ergot fungus..., which will give the eater a psycho-active reaction..., as ergot is the base source for the process that produces LSD.
Stick to corn meal. I like to use Goya brand "corse" cornmeal that I find in the Hispanic foods section of my local market. John Curry uses cornmeal and water, and I like to use a pinch of salt. The water holds the meal together, and he toasts them on the white, hot, ashes.
Horace Kephart wrote in1910,
Johnny Cake 1 qt corn meal, 1 tsp of salt, 1 pint warm (but not scalding) water. Stir together until light. Bake to a nice brown all around (about forty-five minutes), and let it sweeten fifteen minutes longer in the closed [dutch] oven, removed from the fire. Yellow meal generally requires more water than white. Freshly ground meal is much better than old.
Ash Cake - Same kind of dough [as johnny Cake]. Form it into balls as big as hen's eggs [probably the size of "medium" sized eggs today], roll in dry flour, lay in hot ashes, and cover completely with them.
Except for the flour coating, they are the same as Mr. Curry makes. Field cooking hadn't changed much from the 18th century to the mountains of Tennessee and North Carolina where Kephart learned his field cooking in the 20th century.
LD