Chicken Pot Pie with Mushrooms & Thyme

Directions:

• Preheat oven to 200°C. Line a baking sheet with baking paper.
• To make the filling, in a 4.7-litre Dutch oven over medium heat, melt the butter. Add the flour and cook, stirring constantly, until the mixture smells fragrant and nutty, about 2 minutes. Whisk in the Madeira and demi-glace. Slowly add the chicken stock, whisking until smooth, and bring to a boil. Add the diced onion, celery, mushrooms, thyme, tarragon and bay leaf and cook until the vegetables are almost tender, about 10 minutes. Add the potatoes, chicken and pickling onions and season with salt and pepper. Cook until the potatoes and onions are tender, about 10-15 minutes. Remove from the heat and let cool for 10 minutes. Remove the bay leaf and discard.
• To assemble the pot pie, on a dry work surface, gently unroll the filo. Cut the filo in half horizontally. Cover half of the filo with a slightly damp paper towel and set aside. Spread 1 filo sheet from the second stack on your work surface and, using a pastry brush, lightly brush with melted butter. Cover with a second sheet, rotating it clockwise slightly, and brush it with more butter. Repeat with the remaining sheets from the second stack, rotating each one slightly and brushing each with butter. Carefully lift the stack of buttered filo and place it on top of the pot pie, folding the dough up as necessary along the edges of the pot. Brush the filo with the egg wash and sprinkle with sea salt.
• Bake until the filo is crisp and browned all over, 15 to 20 minutes, covering the edges of the filo with aluminium foil about halfway through the cooking time if necessary to keep them from turning too brown. Remove from the oven and let cool about 10 minutes before serving.
• While the pot pie is cooking, prepare the remaining filo. Spread 1 of the remaining filo sheets on your work surface and, using a pastry brush, lightly brush with melted butter. Cover with a second sheet and brush it with butter. Repeat with the remaining sheets of filo, brushing each with butter. Using a sharp knife, cut the sheet of filo into 8 triangles of equal size. Transfer the triangles to the prepared baking sheet.
• While the pot pie is cooling, place the filo triangles in the oven and bake until lightly browned and crispy, 8 to 10 minutes.
• To serve, spoon the pot pie onto warmed plates or shallow bowls and arrange a filo triangle on top of each serving.