If you are looking for a great change to your typical potato side dishes, this amazing casserole-type potato dish is for you! Boulangère Potatoes, also known as Pommes Boulangère, are made with simple everyday ingredients and require no special equipment, but are definitely flavoursome and elegant enough even for the most special of occasions. What is more, this French Onion Potato Bake is extremely versatile, making it a perfect accompaniment for a range of meats, poultry and vegetarian recipes.
Preheat the oven to 160°C Fan. Lightly grease an ovenproof dish with butter (we used 21x21cm ovenproof dish).
Prepare the stock and set it aside (no need to keep it hot).
Slice the potatoes into thin slices (about 3mm thick).
Melt the butter in a large frying pan on low heat. Add the sliced onion and finely chopped rosemary. Stirring occasionally, sautee the onions for 7-8 minutes, until soft, but not browned.
Place a single layer of potatoes (slightly overlapping) to the base of the greased ovenproof dish. Season with a little salt and pepper. Add a layer of onions on top.
Repeat with the layers again and again, and finish with a layer of potatoes.
Place a layer of sliced potatoes on the bottom of the baking dish, season with salt and black pepper, and then follow with a layer of the onion mixture.
Pour the vegetable stock over the potatoes. Scatter the grated parmesan on top and place the potatoes in the oven for 55-60 minutes. Potato slices should be soft and the top layer golden brown.