In a large bowl, combine the cooked farro, cherry tomatoes, red onion, olives, fresh herbs, and feta cheese. Toss gently to combine.
1/2 medium red onion, diced , 3/4-1 cup halved cherry tomatoes, 1-2 cups fresh arugula , 1/4 cup chopped fresh mint, 1/4 cup chopped fresh dill , 1/3-1/2 cup crumbled feta cheese, 1/3 cup sliced kalamata olives