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Preheat oven to 325°F.
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Line large baking sheet with parchment paper.
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Stir 3/4 cup butter in heavy medium saucepan over medium-low heat until melted.
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Remove from heat.
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Stir in nuts, sugar, flour, orange peel and salt; then stir in egg.
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Drop some batter by generous tablespoonfuls onto prepared baking sheet, spacing 3 inches apart (cookies will spread).
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Bake cookies until lacy and golden brown, about 15 minutes.
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Gently slide parchment paper with cookies onto rack; cool completely.
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Transfer cookies to paper towels.
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Repeat with remaining batter, lining cooled baking sheet with clean parchment for each batch.
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(Can be made ahead. Store between sheets of waxed paper in airtight container at room temperature up to 1 week or freeze up to 1 month.).