INGREDIENTS
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2 large egg yolks
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1 sheet frozen puff pastry (one 14-ounce package or half a 17.3-ounce package), thawed
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All-purpose flour (for dusting)
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4 precooked pork sausages (such as andouille or kielbasa; about 1 pound), halved lengthwise
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1/2 t. baking soda
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Kosher salt and poppy seeds (for sprinkling)
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Whole grain Dijon mustard (for serving)