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To make the dough: Stir together the dough ingredients, starting with the lesser amount of water; mix until combined, adding more water if the dough feels dry.
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Cover the bowl and let rest for 20 minutes. Then mix and knead until it's soft and smooth, about 5 minutes. Cover, and let rise for about 1 1/2 to 2 hours, until puffy.
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To make the filling: While the dough is rising, combine the sugar, cinnamon, and ClearJel. Stir in the butter, boiled cider, and apples.
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To shape the loaf: On a lightly floured sheet of parchment, roll the dough out to a 11" x 17" rectangle. Spread the filling over the dough, leaving a 1” border bare on all sides. Scatter the nuts evenly over the filling.
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Starting with a short end, roll the dough gently into a log, then pinch the seam and ends to seal.
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Cut the dough in half lengthwise. Keep the cut sides facing up while you twist the two pieces together, then tuck the ends underneath. Place the loaf in a greased tea loaf pan or a 9" x 5" pan.
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Cover and let rise until the loaf is 1" above the rim of the pan, 1 1/2 to 2 1/2 hours.
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Toward the end of the rise, preheat the oven to 350°F. When ready to bake, uncover, brush lightly with the egg wash, and sprinkle with sparkling sugar.
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Bake the tea loaf for 40 to 50 minutes or for a 9" x 5" pan, bake for 50 to 60 minutes, tenting with foil for the final 15 to 20 minutes. Remove from the oven and loosen the edges with a heatproof spatula. Cool for 10 minutes, then turn out of the pan onto a rack to cool completely.
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Storage information: Store well wrapped at room temperature for up to 3 days; freeze for longer storage.