Cook the pasta: Bring a large pot of salted water to a boil.
Cook the pasta until just al dente. Reserve 1/4 cup pasta water, then drain and rinse under cool water to stop the cooking. Toss with a drizzle of olive oil so it doesn’t stick.
Blanch the green veggies: In the same pot of boiling water, blanch asparagus for 1–2 minutes, then add peas for 30 seconds.
Drain and rinse with cold water to keep them crisp and bright.
Make the dressing: Whisk olive oil, lemon zest, lemon juice, Dijon, honey, garlic, salt, and black pepper until emulsified. Adjust sweetness, salt, and lemon to taste. The flavor should be bright and zippy.
Combine the base: In a large bowl, add cooled pasta, chicken, asparagus, peas, cucumber, radishes, onion, and tomatoes.
Pour over about two-thirds of the dressing and toss gently to coat.
Add herbs and cheese: Fold in parsley, dill, and feta. If the salad looks dry, add more dressing and a splash of the reserved pasta water to loosen and help the dressing cling.
Rest and taste: Let the salad sit for 10–15 minutes in the fridge. Taste and adjust salt, pepper, and lemon.
Finish with a drizzle of olive oil if desired.
Serve: Enjoy chilled or at cool room temperature. Add extra herbs or a squeeze of lemon right before serving for a fresh lift.