• Preheat oven to 180°C (356°F).

Prepare the filling

• Slice the mushrooms into slices. Slice the leeks halfway lengthwise. Remove the outer layer and cut into half moons. Peel and grate the potatoes.
  2 medium leeks, 500 g button mushrooms, 2 small potatoes
• Heat 1.5 tablespoon oil in a pan, add leeks, and sauté until softened. Add grated potatoes and mushrooms, and cook until mushrooms release their water and mixture dries out. Season with salt, pepper, garlic granules, Vegeta and dry mixed herbs.
  ⅛ teaspoon Garlic granules, 1 teaspoon mixed herbs, vegetable oil, 1 teaspoon vegeta seasoning, salt to taste

Prepare the pastry

• Mix 2 tablespoon of oil with 6 tablespoon of water to create a brushing mixture.
• Brush your round baking pan with oil.

Layer the filo sheets

• Lay the first sheet of filo dough over the pan, letting some hang over the edges. Brush roughly with the oil mixture. It doesn't have to be all perfectly brushed. See photos and video above for help! Add another sheet in the opposite direction, no oil this time. Add another in the opposite direction (3 total)
  1 filo pastry roll
• Now fold a new sheet into a square, place it in the center of the pan, and brush with the oil mixture. Add another square sheet and brush with the oil mixture (2 squares). Top with another sheet, this time not hanging over the sides but make sure it stays in the circle by folding the sides inwards. Brush with the oil mixture.
• Now start adding a few tablespoon of the filling (3-4 tbsp). Top with a sheet making sure it stays in the circle, brush with oil mixture, another sheet, this time no oil and add the filling. Repeat until the filing is finished (you should be able to do 4 layers of filling) but make sure you have at least 3 sheets remaining for the top layer. Once you finish the last filling, top it like the rest with two sheets, oil the top sheet and place an extra crumbled sheet on top.
• Now brush it with the oil mixture and fold in the sides that were hanging off since the beginning. Make sure this last sheet is all brushed with the oil mixture. You might finish the oil and water mixture so you might need to make some more, with the same rain of 1:3 oil to water.

Bake

• Bake for 35–40 minutes until golden brown, crisp on top, and cooked through.

Cool and serve

• Let cool slightly before cutting.