Shrimp and String Bean Pesto Pasta

rotini or penne pasta

medium or large raw shrimp, cleaned, deveined and tails off

string beans, ends trimmed, cut in half

pesto sauce (recipe follows)

parmesan cheese, for serving

packed cups fresh basil leaves

extra-virgin olive oil

fresh Parmesan, grated

chopped walnuts

garlic, finely chopped

coarse salt