Finely chop the red onion and garlic. Drain the tuna and flake it with a fork in a bowl.
Sauté the red onion in a little oil over medium heat for 4-5 minutes, until softened and translucent. Add the garlic and cook for another minute, being careful not to burn it, as it can become bitter.
Combine the sautéed onion and garlic with the tuna. Add the lemon juice, chopped parsley, salt, and pepper. Mix well and let it cool slightly.
Cut the filo pastry sheets into long strips. Place a tablespoon of filling at one end of each strip, then fold the pastry in a triangular shape to enclose the filling.
Seal the end of the pastry with a little water or oil. Ensure that the samosas are tightly folded, otherwise the filling may leak out during frying.
Heat the oil in a medium saucepan over medium heat. The oil is ready when a small piece of pastry turns golden brown in 8-10 seconds.
Fry the samosas in batches until golden brown, about 2-3 minutes per side. Do not overcrowd the oil to maintain its temperature.
Remove the samosas and place them on a paper towel-lined plate to absorb any excess oil. Serve warm for the best crispy and flavorful experience.
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