INGREDIENTS
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5 tablespoons unsalted butter, divided
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1 cup finely chopped kimchi, plus 1/3 cup kimchi juice
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2 tablespoons gochujang (Korean hot pepper paste)
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1/2 cup low-sodium chicken broth
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1 pound fresh or frozen udon noodles
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Kosher salt
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4 large egg yolks, room temperature
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3 scallions, white and pale-green parts only, thinly sliced on a diagonal
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1 tablespoon toasted sesame seeds