1. Heat oil in large skillet.
2. Add onion, garlic and mushrooms, and cook until onions are tender and mushrooms have given off their liquid.
3. Combine chicken broth and cornstarch; whisk until smooth.
4. Add to skillet, and cook until sauce is thickened and translucent.
5. Add shrimp, parsley, peas, lemon juice, zest, and tomato; cook until heated through.
6. Prepare pasta according to package directions.
7. Toss pasta with shrimp mixture.
8. Garnish with Parmesan cheese, and serve.