Cream butter and shortening in a large mixing bowl; gradually add sugar, beating
well at medium speed of electric mixer.
Add eggs, one at a time, beating well after each addition.
Add vanilla extract; beat until blended.
Combine flour, baking powder
and baking soda; gradually add to creamed mixture, mixing after each addition.
Chill dough for 1 to 2 hours.
Divide dough into fourths. Divide each fourth into 16 portions. Roll each portion
into a 4-inch rope; fold each rope in half, and twist. Place twists 2 inches apart
on greased baking sheets. Combine egg yolk and water; brush over twists. Sprinkle
lightly with cinnamon and sesame seeds.
Bake at 325 degrees F for 20 to 25 minutes or until light golden brown.
Immediately transfer to wire racks to cool.
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