Preheat your oven to 425°F. Toss fennel and radishes with olive oil and a pinch of salt on a sheet pan. Roast for 15 minutes, then add asparagus, drizzle with more oil, and roast for another 15 minutes until everything is caramelized.
Combine farro, water, and a pinch of salt in a saucepan. Bring to a boil, reduce heat, and simmer for 25 minutes until tender but still slightly chewy. Drain and let it cool slightly before combining with the sauce.
In a food processor, blend Greek yogurt, parsley, basil, chives, lemon zest, lemon juice, and Dijon mustard. Process until smooth and flavorful, then season with salt to taste.
Transfer farro to a serving bowl and toss with the herb yogurt sauce. Layer roasted vegetables on top, and garnish with minced chives, fennel fronds, and a squeeze of lemon. Serve warm or let cool for a refreshing cold salad.