INGREDIENTS
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5 cups water
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3/4 cup white vinegar
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1/4 cup malt vinegar, plus more for serving
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Coarse salt
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1 + 1/2 pounds russett potatoes, cut into 3/4-inch cubes
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2 tablespoons extra-virgin olive oil, plt aus more for greasing the pan
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1 teaspoon cornstarch
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fresh black pepper