Prep your veggies: wash, chop, and rinse everything. Keep it crisp and colorful.
In a big bowl, tumble in tomatoes, cucumber, red onion, olives, and parsley. Give it a little toss so the colors mingle like old friends.
Whisk olive oil, vinegar or lemon juice, oregano, and a pinch of salt and pepper in a small bowl. It should be zippy, not shy.
Pour the dressing over the salad. Toss gently until everything glistens, and the feta gets a chance to shine.
Season to taste. If you like a punch, a tiny squeeze of lemon can brighten things up even more.
Serve immediately or chill for 15–20 minutes. Either way, it’s delicious and keeps its snap.