1/2 lb green beans, trimmed and cut diagonally into 1/2-inch pieces
1/4 cup pecans, toasted
2 tablespoons finely chopped fresh flat-leaf parsley
1 1/2 teaspoons finely grated fresh lemon zest
4 teaspoons extra-virgin olive oil

Cook beans in a 4-quart saucepan of boiling salted water until just tender, about 5 minutes, then drain well in a colander. Transfer to a bowl and toss with nuts, parsley, zest, oil, and salt and pepper to taste.