In large bowl, dissolve yeast in warm water. Stir in half of the flour, the salt, sugar and 1 teaspoon oil. Stir in enough of the remaining flour to make dough easy to handle. Place dough on lightly floured surface. Knead about 10 minutes or until smooth and springy. Grease large bowl with shortening. Place dough in bowl, turning dough to grease all sides. Cover, let rise in warm place 20 minutes. Gently push fist into dough to deflate. Cover; refrigerate at least 2 hours but no longer than 48 hours. (If dough should double in size during refrigeration, gently push fist into dough to deflate.