Cook the pasta according to package directions. Reserve 1/2 cup of the pasta cooking liquid. Meanwhile, heat the olive oil over medium heat in a large skillet. Add the onion and saute until tender, about 5 minutes. Add the peas, pesto sauce, pepper and salt. Cook, stirring occasionally, about 5 minutes.
Add 1/2 cup of the pasta cooking liquid to the skillet and bring to a simmer. Add the shrimp or surimi seafood and cook until thoroughly heated. Divide the linguine among 4 bowls or shallow plates. Pour the sauce over the pasta and toss gently. Sprinkle with parsley.