01 - Preheat oven to 425°F (220°C). Line a baking sheet with parchment paper.
02 - Combine pearl barley, water, and salt in a medium saucepan. Bring to a boil, reduce heat to low, cover, and simmer for 25 to 30 minutes until tender. Drain excess water and fluff barley with a fork.
03 - On the lined baking sheet, toss diced sweet potato, bell pepper, zucchini, and broccoli florets with olive oil, ground cumin, smoked paprika, salt, and black pepper. Spread evenly and roast for 20 to 25 minutes, stirring halfway through, until vegetables are golden and tender.
04 - In a mixing bowl, whisk together tahini, lemon juice, maple syrup or honey, grated garlic, and a pinch of salt. Gradually add water until the dressing is smooth and pourable.
05 - Divide cooked barley among four bowls. Arrange roasted vegetables, halved cherry tomatoes, baby spinach, and avocado slices over barley. Drizzle generously with tahini dressing.
06 - Top each bowl with toasted pumpkin seeds and crumbled feta, if desired. Serve immediately.