01 - Preheat oven to 400°F. Place the head of garlic on a piece of foil, drizzle with 1 teaspoon olive oil, wrap, and roast for 30-35 minutes until soft and golden.
02 - Toss mushrooms and red onion with remaining olive oil, salt, and pepper. Spread on a baking sheet and roast for 20-25 minutes, stirring halfway, until browned and tender.
03 - In a medium pot, combine farro, vegetable broth, and salt. Bring to a boil, reduce heat, cover, and simmer for 25-30 minutes until tender and chewy. Drain any excess liquid.
04 - Mix Greek yogurt with parsley, dill, chives, lemon juice, salt, and pepper in a small bowl.
05 - Once garlic is cool, squeeze roasted cloves from the skins and gently mash.
06 - Divide farro among serving bowls. Top with roasted mushrooms, onions, and spinach. Add a dollop of herbed yogurt and swirl in roasted garlic. Sprinkle with toasted walnuts or pine nuts. Serve with lemon wedges if desired.