Horiatiki Salata (Hearty Greek Salad) for Two

Ingredients

• 14 ounces tomatoes, cored
• 1/2 teaspoon table salt, divided
• 1/4 red onion, sliced thin
• 1 tablespoon red wine vinegar
• 1/2 teaspoon dried oregano, plus extra for seasoning
• 1/4 teaspoon pepper
• 1/2 English cucumber, quartered lengthwise and cut into ¾-inch chunks
• 1/2 green bell pepper, cut into 2 by 1⁄2-inch strips
• 1/2 cup pitted kalamata olives
• 1 tablespoon capers, rinsed
• 2 1/2 tablespoons extra-virgin olive oil, divided
• 1 (4-ounce) block feta cheese, sliced into ½-inch-thick triangles