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["In large bowl, dissolve yeast in warm water and let stand til foamy, about 5-10 minutes.", "Stir warm milk, orange juice, sugar, ricotta, orange zest, salt, and egg into the yeast mixture.", "Using the paddle attachment, beat 2 cups flour on low speed into the yeast mixture until a wet dough forms.", "Beat in the remaining dough, 1/2 cup at a time, until a stiff dough forms.", "Turn dough out onto a lightly floured surface and knead until smooth and elastic, about 5-10 minutes, adding more flour as needed to prevent sticking.", "Place dough into a large greased bowl, turn to coat.", "Cover loosely with a damp towel or cloth and let rise in a warm place til doubled in bulk, about 1 1/2 hours.", "Grease a 10"" springform pan.", "Punch down dough and turn out onto a lightly floured surface and knead for 1 to 2 minutes.", "Divide the dough into 3 equal pieces and roll each piece into 20"" long ropes.", "Braid the ropes together.", "Coil braided dough into prepared pan and tuck ends under.", "Cover loosely with a damp towel and let rise again til almost doubled, about 30 minutes.", "Brush dough with the glaze.", "Bake in 425 oven about 25-30 minutes til the top of the cake is golden brown.", "Turn cake out onto a wire rack to cool slightly.", "Icing:.", "In small bowl, stir together powdered sugar and orange juice til smooth.", "Spread icing over warm cake.", "Serve warm."]