Potato, Leek and Mushroom Gratin

Next up. I managed to get a bit behind with my potato consumption and they were piling up, somewhat out of control in the vegetable basket. Anyone who know my cooking, will know that I make rather a lot of potato gratins. I tend to incorporate all sorts of greens as a hidden middle layer –from Cavalo Nero to Kale to Cabbage. The potato can just as easily be replaced, be it celeriac, parsnip, carrot, beetroot or swede. The possibilities are endless. This is one of my favourites – Potato, Leek and Mushroom. The mushroom adds a meatiness which makes it substantial enough to serve on its own just maybe with a salad. For a real treat add a little white truffle oil with the mushrooms once you have removed them from the heat.

Potato, leek and mushroom gratin on plate

Potato, Leek and Mushroom Gratin
This makes a very large gratin. You can cut the amount easily by 1/3 or 2/3
1 cup milk (250mls)
3 cups Double cream (750mls)
3 whole peeled garlic cloves
Small bunch of thyme, tied tightly with a piece of string
2 garlic cloves thinly sliced
2 tablespoons olive oil
10 sliced mushrooms
3 Leeks cut in rings
Salt and pepper, to taste
3 pounds (1.4kg) baking potatoes, sliced thin

In a saucepan, combine milk, cream, whole garlic cloves and thyme over low-medium heat being careful not to boil over. Gently boil for about 20 minutes. Season with salt and pepper and remove from heat.
Meanwhile, coat a frying pan with olive oil and place over medium heat. Sauté the mushrooms until golden brown. Add the chopped garlic and cook for a minute more. Remove. Heat another frying pan and sauté leeks in butter and olive oil until just beginning to caremelise for about 15-20 minutes. Season with salt and pepper. Arrange 1/2 of the sliced potatoes. Arrange remaining potatoes on top. Press the layers down with a spatula to condense.

Remove the thyme fron the cream, pressing it to remove the juices. Mash up the garlic cloves until they dissolve. Check the seasoning of the cream. It needs to season all those potatoes. Pour the infused milk over the potatoes. Cover the dish with foil and place in a preheated 170 degree oven. Bake for about 1 hour until the potatoes are tender. A knife should easily insert in the middle. Uncover and bake for 15 additional minutes until gratin is golden around the edges. Let stand 10 minutes before cutting.

leeks in pan

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