Prep the Vegetables: In a large, shallow serving bowl, combine the rustic tomato wedges, thick cucumber half-moons, thinly sliced red onion, and pitted Kalamata olives.
Season Lightly: Toss the vegetables gently with a light pinch of sea salt. Note: Go easy on the salt, as the feta and olives will add plenty of brine later.
Emulsify the Dressing: In a small glass jar with a tight-fitting lid, combine the extra virgin olive oil, red wine vinegar, minced garlic, dried oregano, Dijon mustard, and black pepper. Shake vigorously until the mixture thickens and blends beautifully.
Assemble: Pour the homemade vinaigrette evenly over the tossed vegetables.
Add the Feta: Place the solid block of Greek feta cheese directly on top of the seasoned vegetables (do not crumble it for true village-style presentation).
Final Touch & Serve: Sprinkle a generous pinch of dried oregano over the cheese and vegetables, drizzle with a final touch of olive oil if desired, and serve immediately with crusty pita bread.