Thaw frozen peas by placing them in a colander and running under cold water for about 30 seconds, or let sit at room temperature for 10 minutes. Drain well.
In a large bowl, combine thawed peas, rinsed chickpeas, diced cucumber, chopped dill and parsley (and red onion if using).
In a small bowl or jar, whisk together lemon juice, lemon zest, olive oil, salt, and pepper until emulsified.
Pour the dressing over the salad and toss gently until everything is evenly coated.
Let the salad rest for at least 10 minutes at room temperature to allow flavors to meld. Taste and adjust salt or lemon if needed.
Serve at room temperature or chilled. Enjoy!