NOTE: This recipe does not give instructions for mixing dough. Mix as you would any cake that uses yeast and then follow instructions below. Dough: Knead into a smooth elastic dough, let rise until double in size, about 1 hour. Roll dough very thin, about 3 feet long and 1 1/2 feet wide on floured plastic sheet. Spread poppy seed filling on rolled dough and roll like as for jelly roll. Place in greased long narrow loaf pans. Let rise for 1/2 hour. Bake at 350 degrees for 50 to 60 minutes. ~-POPPY SEED FILLING:-Boil Filling Ingredients for 10 minutes or until thick enough to spread. Cool and spread on thin rolled dough.