INGREDIENTS
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1 cup all-purpose flour
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1/2 teaspoon salt
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3/4 stick (6 tablespoons) cold unsalted butter, cut into 1/2-inch cubes
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1 large egg, lightly beaten
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1 medium leek (white and pale green parts only), quartered lengthwise, then cut crosswise into 1/3-inch pieces
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1 lb medium asparagus, trimmed
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1 tablespoon unsalted butter
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1/2 teaspoon salt
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1/2 teaspoon black pepper
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1 1/3 cups heavy cream
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3 large eggs
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2 teaspoons finely chopped fresh tarragon
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2 teaspoons water