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Mix and knead all of the bun ingredients by hand, mixer, or bread machine to make a soft, smooth dough. Depending on the moisture in the room, you can adjust the water volume as needed. Divide the dough into three pieces. Place them in a lightly greased cast iron pan. Cover the dough and let it rise until it's nearly doubled in bulk, about 1 to 2 hours. Brush the buns with egg wash. Sprinkle buns with the seeds of your choice. Bake the buns for 15 to 18 minutes, until golden. Cool the buns.