Dissolve 1 package of dry yeast and teaspoon of sugar in warm water. Let stand 10 minutes. Add warm scalded milk and flour. Blend butter, sugar, eggs and salt. Add to yeast mixture. Stir in vanilla, lemon rind and flour. Knead 10 minutes. Dough will be soft. Put in greased bowl. Cover with cloth and place in warm spot until double in bulk. Punch down and let rise again. Roll to 1/4-inch thickness. Brush with egg white. Spread filling. Roll up and place on greased baking sheet. Let rise and bake 10 minutes at 350 degrees. Reduce to 300 degrees for 50 minutes. For sheen, brush with beaten egg yolk just before done.

Poppy Seed filling: Combine all ingredients except egg white. Brush pastry with beaten egg white and spread on filling.