Keep your warqa or phyllo pastry covered with plastic wrap while working. Brush each sheet of dough with melted butter as you layer. It's easier to layer the pastry inside the round pan but a large flat surface can work too.
Brush a large round pan or flat surface with melted butter and vegetable oil. Layer 5, 12-inch circles of warqa sheets (shiny side down) or double layers of phyllo, allowing the edges to drape over the pan. Butter brush each layer. The first layer will sit in the centre and the other 4 sheets will overlap each other all the way around.
Place a 12-inch circle of warqa (shiny side down) or two phyllo sheets in the centre. Add the vermicelli filling, lightly pressing it into a circular shape, or all around the edges of the pan. Then press down a layer of cooked cod flakes over it. Drizzle the tomato sauce mixture all over the layer of codfish and finish of with sprinkling the grated cheese over the top of the sauce.
Fold the overhanging dough over the filling to fully enclose the pie. Trim excess dough as needed to maintain a neat, circular shape.
Add 2–3 layers of warqa (shiny side up) or 4–5 layers of phyllo on top, butter brushing each layer. Tuck the edges under the pie and smooth out the surface.
Brush the entire pie with melted butter, then with the beaten egg yolk for a glossy finish.