01 - Preheat oven to 425°F. Line a baking sheet with parchment paper. Spread sweet potato, red bell pepper, and red onion on the sheet. Drizzle with 1 tablespoon olive oil, season with salt and pepper, and toss to coat evenly.
02 - Roast vegetables in the oven for 25 minutes, stirring once halfway through, until they turn golden and tender.
03 - While vegetables roast, heat a large saucepan over medium heat. Add the dry farro and toast for 3-4 minutes, stirring frequently until fragrant and lightly golden.
04 - Add vegetable broth or water to the toasted farro. Bring to a boil, reduce heat to low, cover, and simmer for 20-25 minutes until farro is tender but slightly chewy. Drain excess liquid if needed.
05 - In a small bowl, whisk together remaining 2 tablespoons olive oil, lemon juice and zest, red wine vinegar, Dijon mustard, minced garlic, salt, and pepper until combined.
06 - Place cooked farro in a large bowl. Add roasted vegetables, cherry tomatoes, and baby spinach. Pour dressing over and toss gently to combine.
07 - Top salad with crumbled feta cheese, toasted walnuts, and chopped fresh parsley. Serve warm or at room temperature.