In a jar with a lid, add the olive oil, vinegar, oregano, tomato paste, mustard, garlic, salt, and pepper. Shake vigorously to combine.
In a large bowl, add the farro, lentils, kale or radicchio, veggies, and fennel. Pour the dressing over top and toss to coat.
Serve topped with parmesan (if using), nuts (if using), and black pepper.