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1
In a large bowl, crumble yeast in lukewarm milk. Add 2 cups flour. Stir well, and allow to rest 1 hour in a warm place.
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2
Soften chopped raisins in warm water for 30 minutes.
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3
Beat egg, egg yolks, sugar, vanilla, melted butter, salt, and orange zest. Add to yeast sponge. Stir in raisins; add egg mixture and mix until combined. Add 4 cups flour and mix well, forming smooth ball. Dough will be somewhat soft, but not batter-like. Cover dough, and allow to rise until fully doubled, about 1 1/2 hours. Punch down, let rise until double again, about 45 minutes to an hour.
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4
On a lightly floured surface, divide dough into quarters. Working with one quarter at a time, divide it into 12 pieces; keep other pieces of dough covered while you work. Roll the pieces into 1/2 inch balls; set aside to rise until doubled in bulk, about 30 minutes. Continue shaping remaining dough.
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5
Heat oil in a deep-fryer or large saucepan to 375 degrees F (190 degrees C).
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6
Drop 2 or 3 at a time into hot fat, turn when deep golden brown. If removed too soon, dough will be under-done inside. When doughnuts are browned, drain briefly on paper towels and dust with confectioners' sugar or cinnamon sugar (see Cook's Note).
