01 - Preheat the oven to 425°F. Line a rimmed baking sheet with parchment paper and set aside.
02 - Quarter the bell peppers, removing all seeds and membranes. Toss with olive oil, a pinch of salt, and black pepper. Arrange in a single layer on the prepared baking sheet and roast for 20–25 minutes until the skins blister and the edges caramelize. Let cool to the touch, then slice into strips.
03 - Rinse farro under cold running water. Combine with water and ½ teaspoon salt in a medium saucepan. Bring to a rolling boil, reduce heat to low, cover partially, and simmer for 20–25 minutes until grains are tender yet retain a pleasant chew. Drain any remaining liquid and let cool slightly.
04 - In a small bowl, whisk together the extra-virgin olive oil, fresh lemon juice, dried oregano, minced garlic, and Dijon mustard until emulsified. Season with salt and pepper to taste.
05 - In a large mixing bowl, combine the cooked farro, roasted pepper strips, halved cherry tomatoes, diced cucumber, sliced red onion, Kalamata olives, and chopped parsley. Drizzle the vinaigrette over the top and toss gently until everything is evenly coated.
06 - Divide the dressed farro mixture among four serving bowls. Scatter crumbled feta generously over each bowl.
07 - Serve immediately at room temperature, or cover and refrigerate for up to 2 days for a chilled preparation.