INGREDIENTS
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SPONGE
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1/4 cup King Arthur Unbleached All-Purpose Flour
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1 tablespoon instant yeast, SAF Gold instant yeast preferred
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2 tablespoons water
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DOUGH
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1/2 cup pineapple juice
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1/4 cup (4 tablespoons) softened, unsalted butter
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1/3 cup brown sugar
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2 large eggs plus 1 egg yolk, white reserved
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1 teaspoon vanilla extract
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2 3/4 cups King Arthur Unbleached All-Purpose Flour
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2 tablespoons potato flour
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1 1/4 teaspoons salt