Leek and Mushroom Cottage Pie
Published January 8, 2019
- Total Time
- 1½ hours
- Rating
- Comments
- Read comments
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Ingredients
FOR THE FILLING
2 tablespoons unsalted butter
1 large onion, diced (about 1 ½ cups)
Salt and pepper
4 medium leeks, tender green and white parts, split lengthwise and cut in 1-inch pieces (about 4 cups)
2 tablespoons olive oil
1 pound medium-brown or white mushrooms, quartered
½ pound shiitake mushrooms, caps only, sliced ¼-inch thick
2 teaspoons chopped fresh thyme
2 small garlic cloves, minced
2 tablespoons chopped parsley
2 tablespoons white miso (optional)
2 cups whole milk
2 tablespoons cornstarch, dissolved in 2 tablespoons cold water
FOR THE TOPPING
3 pounds russet or yellow-fleshed potatoes, peeled and cut in 2-inch chunks
6 tablespoons unsalted butter
½ cup heavy cream
Salt and pepper
1 cup homemade coarse dry bread crumbs
Preparation
- Step 1
Heat oven to 350 degrees. Put butter in a large skillet or Dutch oven over medium-high heat. Add onions and season with salt and pepper. Cook, stirring occasionally, until softened and beginning to color, 5 to 7 minutes.
- Step 2
Add leeks, a little more salt and stir to combine. Cook mixture for about 5 minutes more, until leeks have lost their crunch, but are still green. Turn off heat.
- Step 3
Cook the mushrooms separately (work in batches if necessary): Put olive oil in a large skillet over medium-high heat. When oil is wavy, add both kinds of mushrooms and sauté 2 to 3 minutes, until lightly browned. Season with salt and pepper. Turn off heat and stir in thyme, garlic and parsley, and toss to coat.
- Step 4
Add mushrooms to onion-leek mixture, and turn heat to medium-high. Add miso and milk, and bring to a simmer. Stir cornstarch and water, add to mixture and simmer for 2 minutes, stirring, until sauce thickens. Transfer mixture to a 9-by-13-inch baking dish, and leave at room temperature.
- Step 5
Meanwhile, boil potatoes in salted water until very soft, about 15 minutes. Drain potatoes and mash with 4 tablespoons butter, then stir in cream and beat until smooth. Season with salt and pepper.
- Step 6
Spread mashed potatoes evenly over surface of vegetable mixture. Sprinkle with bread crumbs and dot with remaining 2 tablespoons butter. Bake for 45 minutes, until bubbling and nicely browned.
Private Notes
Comments
The secret to getting the topping right is to use cold, leftover mash. If it’s hot when you bake it, it can turn into a sludgy mess. But if it’s cold, this is when it crisps up nicely into a golden brown in the oven. Also a note on veganising recipe, cashew nuts soaked in water and then blitzed make a fine cream replacement.
I haven't made this yet, but when I do, based on the reviews here, I'm going to roast my mushrooms rather than sautee them. Roasting mushrooms at a high heat makes them chewy and meaty-tasting, plus one can do them all at once, so it's less work, and there are fewer pans taking up stove space. I'll slice them, toss them in olive oil, s&p, and a pinch of sugar and roast at 500 for 20-25 minutes, turning once. While they are in the oven, I can get the rest done while mushrooms are cooking.
Tip from a Brit: (A few dashes of) Worcestershire sauce should be as good an addition to a veggie pie as it is traditionally to Shepherd's Pie.
It was a good dish, but remotely close to anything like shepherds pie. More like a cross between creamed leeks and a mushroom casserole. But it was tasty. Needed way more seasoning though, especially thyme. This would be good to bring to a a non-vegetarian holiday meal (Thanksgiving etc) so I could be sure I’d have something hearty to eat and the others would love this as a side dish.
Looking forward to eating tonight with my family. The small tastes that I have had while making, to ensure enough seasoning, were delightful!
I made this without the bread crumbs (mine had grown bad) and it was absolutely delicious. I used the miso and only a couple pounds potatoes. I was very happy with the results, as was my husband and can’t wait to make it for friends.

