Drain and flake the tuna and place it in a bowl
Add arugula, bitter greens, and cannellini beans to the bowl
In a separate bowl, whisk together Dijon mustard, olive oil, lemon juice, chopped capers, and salt to make the dressing
Pour the dressing over the tuna and salad ingredients and toss to combine
Top the salad with sliced fennel and parsley
Serve and enjoy!
