In a small bowl, proof yeast in the water. Warm sour cream, shortening, and sugar in a saucepan over medium heat--scald but do not allow to boil. Stir in soda and salt, then cool to lukewarm. Pour into large bowl, and add yeast and egg. Add flour, one cup at a time. Turn out onto lightly floured board and knead for about two minutes. Cover dough with a towel and allow to rest for about five minutes, so the dough will firm up. Divide dough in half. Roll each half into a circle roughly 16" in diameter. With a sharp knife, cut eight wedges. Starting with the wide end of each triangle, roll up and shape into crescents.
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