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6 tablespoons cold unsalted butter |
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¼ cup green onion (white and light green parts) thinly sliced |
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2 teaspoons fresh tarragon or 1 teaspoon dry tarragon |
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1 large egg, slightly beaten |
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4 tilapia fillets, 6 – 7 oz (180 – 200 g) each one |
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1/3 cup dry sherry or dry white wine |
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2 teaspoons Dijon mustard |