01 - Rinse barley under cold water. Combine barley, water, and salt in a medium saucepan. Bring to a boil, reduce heat to low, cover, and simmer for 25-30 minutes until tender and water is absorbed. Fluff with a fork and let cool slightly.
02 - While barley cooks, halve cherry tomatoes, dice cucumber and bell pepper, chop spinach, mince red onion, and chop fresh parsley, dill, and basil.
03 - Whisk together olive oil, lemon juice, lemon zest, minced garlic, honey, Dijon mustard, salt, and pepper in a small bowl until emulsified.
04 - In a large mixing bowl, combine cooked barley, tomatoes, cucumber, spinach, bell pepper, red onion, parsley, dill, and basil.
05 - Pour dressing over the barley mixture and toss thoroughly to coat evenly.
06 - Taste and adjust salt and pepper if needed. Serve in bowls, garnished with crumbled feta cheese.