Let's cook.
Place the rinsed cannellini beans into a large mixing bowl.
Add the tuna with its olive oil to the bowl, breaking the fish into large chunks with a fork.
Fold in the diced cucumber, chopped red onion, and halved kalamata olives.
Whisk the harissa paste and lemon juice together in a small separate container to create a dressing.
Pour the dressing over the salad mixture and gently toss to combine.
Garnish with the chopped fresh parsley before serving.
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