Streusel Kuchen

Mix together the mashed potatoes, potato water, shortening and sugar. Add to this about 3 1/2 cups flour and the dissolved yeast. Set this dough aside to rise in a warm place over night. The following morning add the eggs, 1/2 cup sugar and 1 1/2 cups flour. Allow this mixture to stand in a warm place until light. Then roll out pieces 6 by 8 by 1 inch thick and place in greased oblong pans. When cakes are ready to be put into the oven, brush top of cake with melted butter. Strew over the tops of the cakes the topping mixture. This mixture should be