Bring a large pot of salted water to a boil. Add the orzo and cook according to the package instructions until al dente.
While the pasta cools, chop the tomatoes, cucumber, red onion, parsley, dill, and roasted red peppers if using.
Whisk together olive oil, lemon juice, lemon zest, red wine vinegar, garlic, oregano, Dijon mustard, salt, and black pepper.
Add the cooled orzo to the vegetables. Add Kalamata olives, feta cheese, parsley, dill, and oregano.
Cover and refrigerate for at least 30 minutes before serving. This allows the orzo to absorb the dressing and the flavors to develop.
Before serving, gently toss the salad again. Add a small splash of olive oil or lemon juice if the pasta has absorbed too much dressing.
Garnish with extra feta, herbs, olives, or lemon wedges.