INGREDIENTS
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1 cup water
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1 tsp sea salt
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1 tbsp sugar
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6 tbsp butter, cubed
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4.5 oz all purpose flour, sifted (3/4 cup+2 tbsp)
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4 extra large eggs, beaten
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2.5 oz Gruyere, grated (1 cup gruyere)
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freshly cracked black pepper
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1 egg beaten with 1 tsp water, for the egg wash