Dissolve yeast in lukewarm water. Scald milk; add butter, sugar and salt, and cool to lukewarm temperature. Add flour to make a thick batter, then add yeast and eggs, and beat well. Add enough flour to make a soft dough that can be kneaded. Turn out onto a lightly floured surface and knead until smooth and satiny. Place in lightly greased bowl, cover, and let rise until double in size (about 2 hours). When light, punch down and divide dough in workable pieces. Roll out on floured surface. Brush with melted butter, and sprinkle liberally with cinnamon and sugar. Sprinkle with raisins, if using. Roll up tightly along the long edge, and pinch to close edge. Slice into 1-1.5" slices. Place on greased baking sheet. Cover lightly, and let rise until double in size, 30-45 minutes. Bake in a 350°F oven for 15-20 minutes, or until golden brown. Remove from oven and cool. Top with glaze, or your preferred frosting, as desired.