Thaw, rinse, drain, and pat dry sweet peas on paper towels. Place in a medium bowl.
Place thinly sliced red onion in a colander over a bowl of iced water. Allow to sit, 5 - 10 minutes to soak red onion. Drain red onion and pat dry on paper towels. Add the red onion to the sweet peas.
Add the chopped herbs, lemon zest, oil, lemon juice, salt and pepper to the sweet peas/red onion mixture. Gently stir with a spoon. Cover and place in the refrigerator until ready to serve.
When ready to serve, add the grated cheese to the sweet pea salad.
Salad Assembly
Place the torn lettuce in a large bowl. Sprinkle lemon juice and extra virgin olive oil over the lettuce. Sprinkle the salt and pepper. Gently toss the lettuce mixture. Taste for additional seasoning.
Add the Sweet Pea Salad Mixture to the lettuce salad. Add more grated cheese to the salad.
Divide the Sweet Pea Salad/Lettuce among four plates. Top with more cheese, if desired.