How to Make It
Set a small skillet over moderately high heat. Add 1/4 cup of the pine nuts and toast, stirring constantly, until golden, about 4 minutes. Transfer to a plate.
Meanwhile, in a food processor or blender, pulse the remaining 1/2 cup of pine nuts with the garlic until finely chopped. Add the basil, parsley, butter and olive oil and process until the basil is minced. Add the Parmesan and process to a thick puree. Season the pesto sauce with salt and pepper.
In a large pot of boiling salted water, cook the pasta until almost al dente. Add the haricots verts and cook for about 1 minute longer. Drain well.
In a warmed large bowl, toss the hot pasta and haricots verts with the pesto until well coated. Sprinkle with the toasted pine nuts and serve.