01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - In a medium saucepan, combine farro, water, and kosher salt. Bring to a boil, then reduce to a simmer. Cover and cook for 25–30 minutes until farro is tender. Drain any excess water and set aside to cool.
03 - While farro cooks, toss peach slices with olive oil, thyme leaves, and black pepper. Spread on the prepared baking sheet. Roast for 15–18 minutes, turning halfway, until lightly caramelized. Remove from oven and cool.
04 - In a small bowl, whisk together extra-virgin olive oil, white balsamic vinegar, Dijon mustard, honey, sea salt, and black pepper until emulsified.
05 - In a large mixing bowl, combine cooked farro, roasted peaches, baby arugula, red onion, crumbled feta cheese, and toasted almonds.
06 - Drizzle with vinaigrette and toss gently until all ingredients are evenly coated. Serve immediately at room temperature, or chill for 30 minutes for a cold salad.