In a large bowl, beat together vegan sugar, margarine, and milk. Stir in potatoes, applesauce, and salt. Alternately add yeast mixture and flour. Pour into greased bowl. Cover, and let rise until double in size. Work down dough and roll out to ¼ inch thickness. Cut into rolls with biscuit cutter. Dip rolls into melted margarine, fold them over, and place them on an ungreased baking sheet. Allow to rise at room temperature for about 1 hour (or more). Bake at 400 degrees until browned. Brush tops with remaining melted margarine.