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Allow the yeast to rise in 60 ml (1/4 cup) cup of warm milk until doubled in size. Sift the flour into a deep bowl. Make a well in the center and place the yeast in the well. Add the remaining milk, sugar, egg yolks, lemon zest, vanilla, butter and salt. Mix together well and beat with a wooden spoon until blisters begin to form on the dough.
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Place in a greased bowl, cover with a damp towel and allow to rise in a warm place for about an hour or until doubled in volume.
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Divide the dough into two sections. Roll each section out very thinly on a floured cloth, brush with melted butter and spread with poppy seed filling (see below).
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Roll up like a jelly roll, using the edge of the cloth to assist in the rolling. Place the two rolls on a well-greased baking sheet and allow rising in a warm, draft-free place for 30 minutes. Brush the rolls with a well beaten egg white and bake at 180° C (350° F) for about an hour until golden. Cool before slicing and serving.