Cook pasta according to package directions. Meanwhile, in a large cast-iron or other heavy skillet, heat 1 tablespoon oil over medium heat. Add peas; cook and stir until crisp-tender, 2-3 minutes. Remove and keep warm., In same pan, heat remaining oil over medium-high heat. Add shrimp; cook and stir until shrimp turn pink, 2-3 minutes. Add garlic, 1/2 teaspoon salt and 1/4 teaspoon pepper; cook and stir 1 minute longer., Drain pasta, reserving 1/2 cup pasta water. Add pasta to shrimp mixture; stir in peas and tomatoes. In a small bowl, whisk lemon juice, parsley, oil, garlic, lemon zest and remaining salt and pepper until blended. Pour over shrimp mixture; toss to coat, adding enough reserved pasta water to moisten pasta. If desired, sprinkle with additional lemon zest and parsley.