INGREDIENTS
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200 grams (1 cup or 2 sticks) butter, unsalted
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215 grams (1 cup, packed) brown sugar
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90 grams (1/2 cup) granulated sugar
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1 teaspoon salt
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2 teaspoons ground ginger
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1 egg, plus 1 egg yolk
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240 grams (2 cups) all-purpose flour
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1 teaspoon bicarbonate of soda
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150 grams (5 ounces) bittersweet chocolate, chopped