01 - Preheat oven to 425°F. Line a baking sheet with parchment paper. Place asparagus and cherry tomatoes on the sheet, drizzle with 1 tablespoon olive oil, and season with salt and pepper. Toss to coat and roast for 15–18 minutes until tender and caramelized.
02 - Rinse barley under cold water. In a medium saucepan, combine barley and vegetable broth. Bring to a boil, reduce heat, cover, and simmer for 25–30 minutes until tender but chewy. Drain any excess liquid.
03 - In a large bowl, whisk together the remaining olive oil, lemon juice, Dijon mustard, honey, minced garlic, salt, and pepper to create the dressing.
04 - Add the warm barley, roasted asparagus, cherry tomatoes, red onion, and arugula to the bowl with the dressing. Toss gently until well combined.
05 - Transfer the salad to a serving platter. Sprinkle with toasted walnuts and crumbled feta cheese. Serve warm or at room temperature.