1. Heat oil in a skillet over medium heat. Add garlic and red pepper; cook 1 minute. Add clam juice and salt; bring to boil. Reduce to simmer; cover and cook 5 minutes.
2. Bring a pot of water to a boil. Cook pasta according to package directions; drain.
3. Add shrimp, peas, and zest to skillet. Cover and cook 6 minutes or until shrimp are just cooked through. Toss with pasta, lemon juice, and parsley.