Mix brown sugar and cinnamon in a bowl. After you let sourdough rise divide into 3 sections (see recipe for Sour Dough Bread). Roll out dough with a rolling pin on floured board. Sprinkle brown sugar and cinnamon mixture and melted margarine over dough. Roll into a roll, slice into 1 inch thick slices. Put into well greased pan. Let rise at least 4 to 5 hours and bake at 350 degrees for about 20 minutes. Mix 1 1/2 cups powered sugar, a little milk and a teaspoon of vanilla (almond/orange) flavoring together and drizzle over rolls.