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Preheat oven to 350 degrees. Grease a 4x8x12 inch baking dish with 1 tablespoon of butter.
Puree the persimmons until smooth to make 2 cups of thick puree.
Combine the puree with the buttermilk. In another bowl, beat the stick of butter with the sugar in the bowl of a stand mixer with the paddle attachement. Beat until fluffy.
Add the eggs and beat in one by one. Then, by hand, stir the persimmon mixture into the butter and sugar.
Sift the dry ingredients together and fold them into the persimmon mixture. Put the batter into the buttered baking pan.
Place the pan in a larger pan and fill the larger pan about halfway full with water to create a bain marie.