In a medium saucepan, add the 1 cup pearl cous cous, 2 tsp. olive oil, and ¼ tsp kosher salt, and cook over medium heat for 3-5 minutes until the cous cous is golden brown, stirring often.
Add 1 and ¼ cup water, stir, cover, bring to simmer and cook until tender (approx. 6 minutes). Stir and set aside to cool.
Meanwhile in separate saucepan, add the 1 cup farro and 2 cups vegetable broth. Bring to a boil, cover and cook until tender, about 25 minutes. Drain any remaining liquid and spread the farro out on a baking tray to cool.
While the pearl cous cous and farro are cooking, whisk together the dressing ingredients until well combined (1/3 cup olive oil, 1 tsp. kosher salt, ¼ tsp. black pepper, 2 ½ tsp. dijon mustard, 1 tbsp. white wine vinegar, 1 tsp. fine garlic powder, ¼ tsp. dried basil, ¼ tsp. dried oregano, and juice of 1 lemon.
In a large mixing bowl, add the cooled pearl cous cous and farro, the 1 cup cherries, the 2 cups tomatoes, the 1/3 cup red onion, 1/3 cup chopped pistachios, ¼ cup minced dried apricot, 3 tbsp. (packed) fresh mint, ¼ cup (packed) fresh chives, ¼ cup (packed) scallions.
Stir well, add dressing and mix through. Just before serving, squeeze extra lemon juice over the dish and garnish with additional chopped pistachios, fresh herbs, and sliced cherries.