Instructions
Begin by preparing the topping: place the peeled potatoes in a pot of salted water and bring to a gentle boil. Cook until the potatoes are tender and easily pierced with a fork, then drain them well. Pass the potatoes through a potato ricer or mash thoroughly to achieve a smooth texture. Incorporate the butter, double cream, and egg yolks into the mashed potatoes, seasoning generously with salt and pepper. Set this luscious mixture aside, keeping it warm. For the filling, melt the butter in a large, heavy-based pan over medium heat. Add the finely chopped shallots, diced carrots, and celery sticks, gently frying them until softened and aromatic — this should take about 5-7 minutes. Add the minced garlic and cook for another minute, stirring constantly to avoid burning. Pour in the white wine and allow it to simmer for one minute, letting the alcohol evaporate and the flavors concentrate. Stir in the tomato purée along with the chopped tinned tomatoes, then add the chicken stock. Allow this sauce to cook down and thicken for 10 to 15 minutes, stirring occasionally to prevent sticking and to meld the flavors. Add the shredded cooked chicken, black olives, and chopped parsley to the thickened tomato mixture. Season with salt and freshly ground black pepper to taste, mixing thoroughly to combine all elements. Preheat your oven to 180°C (160°C fan) or Gas Mark 4. Transfer the chicken filling to a 20x30cm (8x12 inch) ovenproof dish, spreading it out evenly. Carefully spoon and smooth the creamy mashed potato topping over the filling, ensuring full coverage to lock in the moisture and flavors. Sprinkle the grated Gruyère cheese liberally over the surface of the mashed potatoes, this will add a deliciously nutty and golden crust once baked. Place the dish in the preheated oven and bake for 30 to 35 minutes, until the filling is piping hot and the potato topping is beautifully browned and bubbling. For the best results, let the Chicken Parmentier rest for a few minutes after baking before serving. This allows the filling to set slightly, making it easier to portion. Enjoy this warm, comforting dish with a side of steamed green vegetables or a crisp salad for a delightful meal experience.
