Bring a large pot of water to a boil. Add the green beans and salt and cook just until tender, about 4 to 6 minutes. Drain well in a colander.
In the same pot, over medium-high heat, combine the butter and pine nuts. Cook, stirring frequently, until the pine nuts are lightly toasted, about 2 to 3 minutes. Add the beans; toss to stir well. Season to taste with salt and freshly ground pepper.