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["In a small bowl, mix together the yeast, water and sugar. Set aside.", "In a large bowl, mix the flour, salt and cold butter with a pastry cutter or by hand.", "Make a well in the center and add the egg yolks (save the whites!), sour cream, and yeast mixer. You will know that you yeast has ""bloomed"" properly if it has formed a frothy dome on top. This has 100% to due with the water temperature.", "Mix this together until it forms a dough ball.", "Remove dough from bowl and clean bowl. Grease clean bowl and place dough back inches Cover with a tea towel and put in a warm spot while making filling. I just toss it in the microwave or the oven and it rises just fine.", "To make the filling:", "Place all the filling ingredients in a heavy bottom saucepan and heat to a boil over medium-low heat. Stir constantly. This takes about 20 minutes, but don't leave it because it will scorch.", "Pore into a clean bowl and put in the refrigerator until completely cool. I cheat by put it in the freezer and stirring it every 15 or so minutes.", "When the filling has cooled, divide risen dough into four balls.", "Roll them out on a lightly floured surface into 12""-15"" squares. You can set them aside stacked on each other while you are filling them to save room.", "Spread them with a even layer of poppy seed filling about 1/2"" from the edge. Roll them loosely into logs and place on cookie sheets.", "Let them sit for 20 minutes to rise a little.", "Preheat oven to 425F.", "Rolls with beaten egg white.", "Bake for 25-30 minutes.", "Cool on wire racks and slice into 1/2"" slices.", "Enjoy!"]