Put 1/3 cup toasted walnuts, 1 1/4 cups parsley, 1 small smashed garlic clove, 2 teaspoons Worcestershire sauce and 1/2 teaspoon each grated lemon zest and kosher salt in a food processor. With the motor running, add 1/4 cup olive oil and process until coarsely blended. Cook 1 1/2 pounds green beans in boiling salted water until tender, 5 minutes. Drain and top with the walnut sauce.
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