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To make the dough: Weigh your flour; or measure it by gently spooning it into a cup, then sweeping off any excess. Mix and knead all the ingredients together to make a soft, smooth dough.
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Place the dough in a lightly greased bowl, cover, and let it rise until nearly doubled in bulk, about 60 minutes.
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To make the filling: Combine all of the filling ingredients except the melted butter in a small, heavy saucepan. Bring to a boil over medium-high heat, then reduce the heat to low and simmer for about 15 minutes, stirring occasionally, until thickened. Remove from the heat, and stir in the melted butter. Set aside to cool.
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To assemble the rolls: Gently deflate the dough, and transfer it to a lightly greased work surface. Pat it into a 16" x 12" rectangle.
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Spread the filling evenly over the dough.
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Roll the dough into a log starting with a short edge; pinch the seam closed.
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Cut the log into 9 slices.
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Place the rolls into a lightly greased 9" square ceramic baker, cover, and let them rise until noticeably puffy, about 45 to 60 minutes. You can bake these rolls in a 9" square metal pan, reducing the bake time by about 5 minutes.
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Preheat the oven to 375°F.
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Bake the rolls until they're brown around the edges and golden brown in the center, about 25 to 35 minutes; tent with foil if they appear to be browning too quickly.
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To make the icing: Combine the sugar, Fiori, and enough orange juice to make a spreadable icing.
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Let the rolls cool for 10 minutes, then spread with the icing and serve. Store any leftovers well-wrapped, at room temperature, for several days; freeze for longer storage.