====== Leek and ham hock gratin with rösti topping ======

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https://www.deliciousmagazine.co.uk/recipes/leek-and-ham-hock-gratin-with-rosti-topping/

Serves 6
Hands-on time 35 min, oven time 50 min

Ingredients
  * 100g unsalted butter, plus extra if needed
  * 6 leeks, cut into thirds
  * 2 garlic cloves, crushed
  * ¼ whole nutmeg, grated
  * 50g plain flour
  * 500ml good quality fresh chicken stock
  * 300ml whole milk
  * 2 bay leaves
  * 300g shredded British free-range ham hock (available ready prepared from supermarkets, or use shredded cooked ham)
  * 25g parmesan, grated
  * 800g floury potatoes (about 4 medium baking potatoes)



Method

  - Melt 50g of the butter in a large sauté pan and add the leeks. Cook over a medium heat for 5-6 minutes, turning occasionally, until the leeks are lightly browned and golden all over. Remove the leeks, leaving the butter in the pan. Heat the oven to 200°C/fan180°C/gas 6.
  - Add the garlic to the butter and cook gently for a few minutes until fragrant. Grate in the nutmeg, then stir through the flour. Increase the heat to medium and cook, stirring, for 2-3 minutes – the mixture should be thick and paste-like. Gradually, in a thin stream, pour in the chicken stock, stirring constantly – the mixture should thicken quickly, then gradually thin out, but always stay thick enough to coat the back of a spoon. If it becomes too thin, stop adding liquid and let it bubble for a minute. Once you’ve added all the stock, pour in the milk in the same way, but a little more quickly. You should end up with a glossy sauce with the consistency of double cream. Add the bay leaves and bubble for 2-3 minutes.
  - Put the leeks in a 1.5 litre ovenproof gratin dish and scatter with the ham. Pour over the sauce and top with the parmesan. Give it a gentle stir, then taste and season.
  - Melt the remaining butter in a pan and set aside (see know-how). Peel the potatoes, grate coarsely, then put in the centre of a double layer of muslin or clean J-Cloth. Gather the cloth around and squeeze firmly to remove any excess water.
  - Tip the potatoes into a bowl, pour over the melted butter and some sea salt, then toss with your hands. Scatter over the top of the cheesy leeks and top with a bit more salt. Roast in the oven for 50 minutes. If the rösti browns unevenly, melt a bit more butter and brush it over.
  - When golden and bubbling, remove the dish from the oven, leave for 5 minutes, then serve with leaves.

delicious. tips
  - Make to the end of step 3 up to 2 days ahead, then cool, cover and chill. Or freeze for up to 1 month. Remove from the fridge or defrost to get to room temperature, then finish the recipe.
  - Once you’ve grated the potatoes for a rösti, you need to cook them before they start oxidising (turning brown). Have your butter melted (step 4) and ready to cook before you grate the potatoes.