In a saucepan, cover the cubed potatoes with cold water and season with salt. Bring to a boil, then simmer for 20 minutes or until tender. Drain. Using a potato masher, coarsely crush the potatoes. Let cool.
In a bowl, combine the mashed potatoes, tuna, cheese, parsley and onion. Season with salt and pepper.
On a work surface, layer 2 sheets of spring roll pastry, or fold 1 sheet of brik pastry into a square. Starting at one corner and working your way inward, cover half of the square with one-quarter of the potato mixture. Using a spoon, shape a well in the centre of the filling. Break an egg into the well. Fold the pastry over the filling to create a triangle. Repeat with the remaining ingredients.
In a large non-stick skillet over medium-high heat, heat 1/2 inch (1 cm) of oil. Fry 1 brika at a time for 3 minutes or until golden brown, turning halfway through cooking. Drain on paper towels. Serve with a squeeze of lemon.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.