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In a bowl sift together the flours, matcha, baking soda, baking powder and sugar. With a pastry cutter or your hands, cut in the cold shortening until mixture resembles coarse crumbs. Add in the chopped pistachios, then create a well in the center of the bowl. Add the beaten egg and buttermilk, quickly mix into a soft dough. Turn out onto a lightly floured surface and knead very briefly and lightly ( all you want to do is remove the large cracks - do not over knead). Shape the dough into a round flat ball, just large enough to fit into your iron skillet. Bake in a preheated 425F oven for 50-55 minutes. Remove and place on a wire rack, cover with a tea towel till cooled. Makes 1 loaf.