INGREDIENTS
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1 1/2 pounds green beans, trimmed
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1/2 cup chopped walnuts
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2 tablespoons extra-virgin olive oil, divided
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4 cups thinly vertically sliced onion
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1 teaspoon chopped fresh thyme
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2 teaspoons white balsamic vinegar
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1/2 teaspoon kosher salt
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1/4 teaspoon freshly ground black pepper