Fish pie is a classic comfort food dish that combines flaky fish, creamy sauce, and a crispy potato topping. This recipe takes it up a notch by serving the fish pie with a warm tartare sauce. The pie is filled with a mixture of white fish, smoked haddock, and prawns, all cooked in a rich and flavorful sauce. The topping is made with mashed potatoes, which are then baked until golden and crispy. The warm tartare sauce adds a tangy and zesty element to the dish, making it a perfect choice for a cozy dinner.