In a large bowl, dissolve yeast in warm water. Add 3 eggs, milk powder, butter, brown sugar, molasses, salt, baking soda and 2 cups all-purpose flour. Beat until smooth. Add rye flour and enough remaining all-purpose flour to form a soft dough (dough will be sticky)., Turn onto a well-floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a greased bowl, turning once to grease top. Cover and let rise in a warm place until doubled, about 1 hour. , Divide dough into 30 pieces; shape each into a ball. Place 2 in. apart on greased baking sheets. , In a small bowl, whisk cold water and remaining egg; brush over dough. Sprinkle with caraway seeds and/or kosher salt. Cover and let rise until doubled, about 45 minutes. , Bake at 350° for 14-16 minutes or until golden brown. Remove to wire racks.