Chef John's Whole Wheat Ciabatta
Ingredients:
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1 cup warm water
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½ cup all-purpose flour
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½ cup whole wheat flour
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¼ cup rye flour
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¼ teaspoon active dry yeast
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1 cup all-purpose flour
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1 cup whole wheat flour
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½ cup water at room temperature
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2 tablespoons shelled sunflower seeds
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1 tablespoon polenta
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1 tablespoon ground flax seeds
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1 ¾ teaspoons salt
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1 ½ teaspoons honey
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1 teaspoon all-purpose flour, or as needed
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½ teaspoon cornmeal, or as needed
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water as needed