01 - Rinse pearl barley thoroughly under cold running water. In a medium saucepan, combine barley, water, and salt. Bring to a boil, then reduce heat to low, cover, and simmer for 25–30 minutes until barley is tender. Drain any excess water and allow barley to cool to room temperature.
02 - In a large mixing bowl, combine halved cherry tomatoes, diced cucumber, finely chopped red onion, diced red bell pepper, sliced Kalamata olives, chopped parsley, and chopped mint.
03 - In a small bowl or jar, whisk together extra-virgin olive oil, fresh lemon juice, red wine vinegar, minced garlic, dried oregano, salt, and black pepper until emulsified.
04 - Add cooled barley to the bowl of vegetables. Pour dressing over the mixture and toss thoroughly to ensure even coating.
05 - Gently fold in crumbled feta cheese if desired. Taste and adjust seasoning as needed.
06 - Refrigerate for a minimum of 30 minutes prior to serving to allow flavors to develop. Serve chilled or at room temperature.