01 - Rinse pearl barley thoroughly with cold water. In a medium saucepan, combine barley, water, and salt. Bring to a boil, then reduce heat, cover, and simmer for 25 to 30 minutes until barley is tender. Drain any remaining water and allow barley to cool slightly.
02 - While the barley cooks, dice the cucumber, halve the cherry tomatoes, thinly slice the red onion, and chop the spinach or arugula.
03 - In a small bowl, whisk together extra virgin olive oil, lemon zest and juice, orange zest and juice, white wine vinegar, chopped parsley, chopped mint, chopped dill, honey or maple syrup, salt, and black pepper until emulsified.
04 - In a large mixing bowl, combine the cooked barley, diced cucumber, halved tomatoes, sliced onion, and chopped greens. Pour the citrus herb dressing over the mixture and toss thoroughly to coat all ingredients.
05 - Top the bowl with crumbled feta cheese, if using, and toasted pumpkin seeds or sunflower seeds just before serving.