01 - Preheat oven to 400°F.
02 - In a medium saucepan, combine farro, water, and 1/2 teaspoon salt. Bring to a boil, reduce heat, and simmer uncovered for 25–30 minutes or until tender. Drain any excess water and let farro cool slightly.
03 - Toss grape halves with 1 tablespoon olive oil and a pinch of salt. Spread on a parchment-lined baking sheet and roast for 15–20 minutes, until soft and slightly caramelized. Set aside to cool.
04 - In a dry skillet over medium heat, toast the walnuts for 2–3 minutes until fragrant and lightly browned. Remove from heat.
05 - Whisk together olive oil, lemon juice, honey, Dijon mustard, salt, and pepper in a small bowl.
06 - In a large bowl, combine cooked farro, roasted grapes, toasted walnuts, arugula (or spinach), feta, parsley, and mint (if using). Drizzle with the dressing and toss gently to combine.
07 - Serve immediately or refrigerate for up to 2 hours. Garnish with extra herbs or feta as desired.