Peel and thinly slice the red onion. Drain the tuna and flake it with a fork.
In a bowl, combine the tuna, arugula leaves, thinly sliced red onion, and grated Parmesan cheese.
Add the olive oil, lemon juice, salt, and pepper, and mix well.
Warm the piadina wraps in a skillet over medium heat, lightly toasting each side until slightly crisp.
Evenly spread the tuna salad over the prepared piadina.
Fold the piadina in half and serve immediately.
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