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Wild Mushroom Conserve with Walnut Oil

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Blewit mushrooms preserved in walnut oilI have a lot of different ways I like to preserve mushrooms I’ve learned or come up with myself over the years. This method is one of the more interesting ones, and, I can’t take credit for it. When I started working at Heartland, with it’s daily changing menu that the staff collaboratively designed, one of the first things I remember before opening was that we had a stash of preserves from the old restaurant, treasures taken from one spot to another as the restaurant moved to it’s new home across the street from the St. Paul Saints new stadium.

There were dried morels, herbs, pickles of all kinds, flavors and textures, ferments, and some button mushrooms with a label I’d never seen before that said preserved in walnut oil. I already knew a thing or two about preserving mushrooms, but that was new to me, and sounded pretty darn good.

The preserves were the work of the head preserver/chef tournant/fermenter and all around creative-as-hell day chef Matt, a super tall Scandinavian-looking guy with a penchant for riding bikes, everywhere. Twenty or thirty mile bike rides to and from work were like a stroll in the park for this guy, if you’re a person all about bikes, you’ll know what I mean.  Either way, he was one of the most creative cooks I’ve ever met, and this was a mushroom preserve I saw him make a number of times when some needed processing at the restaurant.

blewit mushroom clitocybe nuda wood blewit

I used blewits (Clitocybe nuda), but you could use a number of different mushrooms. Small firm buttons are the best here.

Do I have to use walnut oil??

It’s only a teency bit more expensive than your average preserve to use nut oil, and it really doesn’t take that much to make a batch. I used a brand of nut oil similar to this one. If you’re really concerned, the liquid left over can be used to make salad dressings, dress roasted vegetables, etc, if you want to re-use it, I suppose.

The flavor is great, and as you might suspect, the mushrooms get perfumed by the oil. Natural, ultra-minimally processed fats from nuts and seeds are just great to have around for all-purpose cooking, too. In my mind, natural nut oils are in the same league with other healthy fats like animal fats and pure butter. While we’re on the topic though, avoid heavily refined nut oils (cheap ones in big jugs) and those intended for polishing wood or other non-culinary products.

Good tasting nut and seed oil substitutions

You could use lots of other nut and seed oils, too, just make sure they have a strong aroma. Smudes sunflower, pumpkinseed, pecan, black walnut, hickory nut and sesame oil would all be fine.

The preserves themselves are best eaten by themselves as an appetizer alongside some charcuterie or cheese, since the flavor of the nut oil is good to appreciate all by itself. If you want to use them in cooking, warm them up and put them on something mild. Warmed up, the mushrooms and their liquid would be great on a little bowl of mashed potatoes, polenta, on top of baked or steamed fish, or some wilted lacinato kale or other cold weather greens.

I used blewit mushrooms (Clitocybe nuda) here, but you could use any small, firm button that would make a great preserve. Chanterelles, Laccaria ochropurpurea caps, and honey mushroom buttons would all make good choices.

Blewit mushrooms preserved in walnut oil

Blewit mushrooms preserved in walnut oil
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Wild Mushroom Conserve with Walnut Oil

Wild mushroom preserves cooked in walnut oil
Servings: 1 pint

Ingredients

  • 6 ounces fresh blewit or other mushrooms preferably buttons, cut into 1 inch pieces, left whole if small, or quartered. The best preserved mushrooms will be made from whole, small buttons.
  • 1 small shallot halved and sliced very thin
  • 1 teaspoon kosher salt
  • ¼ cup dry white wine
  • 5 cracks of the peppermill or 1/8 teaspoon fresh ground black pepper
  • ½ cup walnut oil
  • 1 tablespoon cooking oil for sweating the mushrooms
  • 2 teaspoons chopped fresh sage thyme, or oregano
  • 1/3 cup apple cider or champagne vinegar

Instructions

  • Rinse the mushrooms with water to clean them, but also help add liquid to the preserving liquid.
  • In a pan with deep sides, sweat the mushrooms and shallots with the salt, pepper, sage, and the tablespoon of cooking oil until the mushrooms are soft, covered, about 5 minutes.
  • Be careful the mushrooms and shallots don’t brown, as you want them to stay blonde. Add the wine and simmer for a few minutes more to cook off the alcohol.
  • Finally add the vinegar and walnut oil, double check the seasoning by tasting a mushroom, then transfer to a container and refrigerate until needed.
  • Make sure the mushrooms always stay under a layer of liquid, otherwise they could go bad. The mushrooms will keep for a long time, but you should eat them in a month or two.
  • For long term preservation they could be canned, but the liquid must completely cover everything in the jar.

Blewits preserved in walnut oil

If you want to can something like this, the liquid needs to completely cover the mushrooms in the jar. If you’re jar isn’t full enough, add another shot of vinegar until everything can be pushed under the liquid.

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Next Post: Venison Jerky with Serviceberries »

Reader Interactions

Comments

  1. Lenny Russo

    October 12, 2019 at 5:24 pm

    You are talking about Matt Morgan, a very gifted and all around nice guy. That was a riff on my basic mushroom conserve recipe that was simply sea salt, ground tellichery peppercorns, fresh thyme, cider vinegar and sunflower oil. Matt started experimenting with nut oils using the same basic method and technique but shuffling in different ingredients to startlingly good results.

    Reply
    • Alan Bergo

      October 13, 2019 at 9:31 am

      Yep that’s Matt, If I’m not close with people I don’t use their names. I did just email him a few weeks ago and hopefully he can help me buy a house when I get my act together.

      Reply
  2. Jacqui

    October 21, 2019 at 12:49 pm

    Well I am a bit embarrassed.
    I was all excited because I thought I had found the first blewits of the season (we have had a couple of cold nights) and I thought I’d make these walnut oil preserves, but when I brought them home they were Cortinarius. oops.
    At least I checked.
    The moral is, ALWAYS CHECK!

    Reply

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