INGREDIENTS
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1 3⁄4 cups full-cream milk
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1 onion, peeled and quartered
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Ground nutmeg, a pinch
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2 bay leaves
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4 T butter, plus extra for greasing
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7 T cake flour, plus extra for dusting
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1⁄4 t Hot English mustard powder
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4 free-range eggs, separated
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100 g Gruyère cheese, grated
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100 g Parmesan, grated
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3⁄4 cup cream