In large mixing bowl combine yeast, flour.
Heat milk, shortening, sugar and salt, just until warm, stirring occasionally to melt shortening.
Add to dry mixture in mixing bowl.
Add eggs, grated orange peel, orange juice.
Beat at low speed on mixer for one-half minute; scraping sides of bowl constantly.
Beat three minutes at high speed.
By hand, stir in flour to make soft dough.
Knead dough 8 to 10 minutes on lightly floured surface until smooth and elastic.
Place in lightly greased bowl, turning once to grease surfaces.
cover, let rest in warm place until doubled, about two hours.
punch down ; cover and let rest 10 minutes.
Roll dough in 18x10 inch rectangle, ½ inch thick.
Cut trips 10 inches long and ¾ inch wide.
Roll strips lightly under fingers.
Loosely tie in knot.
Arrange on a greased or non-stick baking sheets.
Cover. Let rise until double (45 minutes).
Bake at 400º for 12 minutes.