01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Arrange the quartered figs on the prepared baking sheet. Drizzle with 1 tablespoon of the olive oil and sprinkle with a pinch of salt and half of the thyme leaves. Roast for 15 minutes until the figs are softened and lightly caramelized. Remove from the oven and let cool slightly.
03 - While the figs roast, rinse the farro under cold running water. In a medium saucepan, combine the farro, water, and 1/2 teaspoon salt. Bring to a boil over high heat, then reduce to a simmer and cook uncovered for 20 to 25 minutes until the grains are tender. Drain any excess liquid and spread the farro in an even layer on a sheet tray to cool to room temperature.
04 - In a large mixing bowl, whisk together the lemon zest, lemon juice, the remaining 2 tablespoons olive oil, honey, Dijon mustard, and the remaining thyme leaves. Season with salt and pepper to taste.
05 - Add the cooled farro, roasted figs, cherry tomatoes, arugula, and sliced red onion to the bowl with the dressing. Gently toss everything together until all the ingredients are evenly coated.
06 - Transfer the salad to a serving platter. Scatter the crumbled feta cheese and toasted nuts over the top. Serve immediately, or refrigerate for up to 2 hours before serving.