Cook the Couscous: Bring 1 cup of water or vegetable broth to a rolling boil in a medium saucepan with a pinch of salt. Stir in the dry couscous, cover immediately with a tight lid, and remove from heat. Let steam for 5 minutes. Fluff gently with a fork and spread onto a plate to cool completely to room temperature.
Prep the Mix-ins: While the couscous cools, chop your sun-dried tomatoes, cube your premium feta cheese, and finely chop the fresh parsley and mint leaves.
Whisk the Dressing: In a small bowl, combine the extra virgin olive oil, fresh lemon juice, minced garlic, a pinch of salt, and freshly cracked black pepper. Whisk vigorously until well emulsified.
Toss and Assemble: Transfer the completely cooled couscous into a large serving bowl. Add the whole Kalamata olives, chopped sun-dried tomatoes, and fresh chopped herbs. Pour the lemon dressing over the top and toss thoroughly until the grains are evenly coated.
Garnish and Chill: Gently fold in the large feta cheese cubes, keeping a few to scatter on top to preserve the pristine presentation. Cover and refrigerate for at least 30 minutes before serving to let the flavors develop beautifully.