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To make the brioche: Prepare the dough up through its first rise.
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Preheat the oven to 350°F. Lightly grease an 8" round cake pan.
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To make the filling: Stir together the filling ingredients.
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Gently deflate the dough, and roll it into an 11" x 16" rectangle. Spread the filling over the dough, leaving a 1" margin along the short edge closest to you.
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Starting with the filled edge, roll the dough into a log, pinching the seam closed. Gently roll the log until it's about 14" long.
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Use a sharp knife to cut the log in half lengthwise. Twist the two halves together, trying to keep the cut sides facing up as much as possible.
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Form the twisted log into a ring and place it in the prepared pan. Cover the russenzopf with a damp cloth or lightly greased plastic wrap, and let it rise for 45 minutes. It won't double in bulk, but will look a bit puffy.
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Bake the russenzopf for 40 to 45 minutes, or until the bread feels firm on top and the internal temperature reaches 190°F. The bread will brown quite a bit due to the nuts — tent it lightly with a sheet of foil halfway through the baking time.
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Remove the bread from the oven, and after 10 minutes gently remove it from the pan and allow it to cool on a rack.
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Store, covered, for 3 days at room temperature, or freeze for up to 3 months.