Bring a large pot of salted water to a boil.
Add peas to boiling water and cook for about 1 minute. Use a slotted spoon to transfer peas into an ice bath.
Once cool, transfer peas to a cutting board and cut them down the middle, long ways.
Whisk together garlic, lemon juice, 3 tablespoons olive oil, salt, and pepper.
Add the halved peas and mix until coated.
In a small bowl, stir the yogurt, 1/4 cup feta, lemon zest, and the remaining 1 tablespoon oil. Season with salt, pepper, and lemon juice to taste.
Spread the yogurt on a plate, and add the peas. Then, scatter the remaining 1/4 cup feta on top.
Drizzle with more oil, add soft-boiled egg cut in half, and top with fennel fronds, toasted pistachios, and flaky sea salt.