Step by Step method

1. Step 1.

   Cut tomatoes into ½-inch-thick wedges. Cut wedges in half crosswise.

2. Step 2.

   Toss tomatoes and ½ teaspoon salt together in colander set in large bowl. Let drain for 30 minutes.

3. Step 3.

   Place onion in small bowl, cover with ice water, and let sit for 15 minutes.

4. Step 4.

   Whisk vinegar, oregano, pepper, and remaining ¾ teaspoon salt together in second small bowl.

5. Step 5.

   Discard tomato juice and transfer tomatoes to now-empty bowl.

6. Step 6.

   Drain onion and add to bowl with tomatoes.

7. Step 7.

   Add vinegar mixture, cucumber, bell pepper, olives, and capers and toss to combine.

8. Step 8.

   Drizzle with ¼ cup oil and toss gently to coat. Season with salt and pepper to taste.

9. Step 9.

   Transfer to serving platter and top with feta.

10. Step 10.

    Season each slice of feta with extra oregano to taste. Drizzle feta with remaining 1 tablespoon oil. Serve.