01 - Preheat oven to 425°F.
02 - Rinse barley under cold water. In a medium saucepan, combine barley, water, and 1/2 teaspoon salt. Bring to a boil, reduce to a simmer, cover, and cook for 25–30 minutes until tender. Drain excess water and set aside to cool.
03 - Place zucchini, red bell pepper, red onion, and cherry tomatoes on a baking sheet. Drizzle with olive oil, sprinkle with salt and pepper, and toss to coat. Roast for 20–25 minutes, stirring once, until vegetables are golden and tender. Allow to cool slightly.
04 - In a small bowl or jar, whisk together olive oil, lemon juice, Dijon mustard, garlic, parsley, basil, dill, honey, salt, and black pepper until emulsified.
05 - In a large bowl, combine cooked barley, roasted vegetables, and herb dressing. Toss gently until everything is well coated.
06 - Transfer salad to a serving platter or bowl. Top with crumbled feta and toasted pine nuts if desired. Serve warm, at room temperature, or chilled.