01 - Preheat the oven to 425°F.
02 - Toss zucchini, red onion, and cherry tomatoes with 2 tablespoons olive oil, salt, and pepper. Spread on a baking sheet in a single layer.
03 - Roast vegetables for 20–25 minutes, stirring once, until golden and tender.
04 - Rinse pearl barley under cold water. Combine barley, water, and 1/2 teaspoon salt in a medium saucepan. Bring to a boil, reduce heat, cover, and simmer for 25–30 minutes, until barley is tender. Drain any excess water.
05 - In a large mixing bowl, whisk together olive oil, lemon juice and zest, red wine vinegar, honey, garlic, parsley, mint, salt, and pepper to make the dressing.
06 - Add warm barley and roasted vegetables to the bowl. Toss gently to combine and coat with the dressing.
07 - Taste and adjust seasoning if needed. Transfer to a serving platter.
08 - Sprinkle with toasted pine nuts and crumbled feta cheese (if using) before serving.