01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - In a medium saucepan, combine the farro, water, and salt. Bring to a rolling boil over medium-high heat, then reduce to a gentle simmer. Cover partially and cook for 25–30 minutes until the grains are tender but still retain a slight chew. Drain any excess liquid and set aside to cool slightly.
03 - Arrange the fig halves cut side up on the prepared baking sheet. Drizzle with olive oil and honey, then sprinkle with the chopped rosemary. Roast for 15–18 minutes until the figs are softened and their edges have caramelized. Remove from the oven and let cool.
04 - In a small bowl, whisk together the extra-virgin olive oil, fresh orange juice, balsamic vinegar, and Dijon mustard until fully emulsified. Season with salt and pepper to taste.
05 - In a large mixing bowl, combine the cooked farro, arugula, thinly sliced red onion, orange zest, and toasted walnuts. Pour the dressing over the mixture and toss gently until everything is evenly coated.
06 - Transfer the salad to a serving platter. Arrange the roasted figs on top and sprinkle with crumbled feta cheese if desired. Serve warm or at room temperature.