Tag Archives | Low Temperature Pasteurization

August Mastery Challenge Round-Up: LTP and Steam Canning

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Hello canners! So sorry for the delayed August report. I came down with the flu on August 31 and it really threw off my work plans. Happily, I’m better now and back with a little round-up. I say little, because on the whole, a lot of you did not like this month’s challenge and so participation was super low. I get it. Not every technique is for every person. Hopefully we’ll all get back on track with fruit butters in September (they’re fun! and versatile! and so tasty swirled into yogurt!).

In August, 32 die hard canners reported their participation in the Mastery Challenge. Of those 32, 25 people tried their hand at low temperature pasteurization and seven took a stab at steam canning.

As is often the case, people reported feeling uncertain about the skills prior to trying them, but once they’d tackled them, those feelings improved. Here are the charts for LTP.

And here are the feelings about steam canning.

These numbers look a little wonky, because only seven people said they tried steam canning, but more are reporting here. I feel like we can probably safely discount four people who said they felt negatively after trying. Though I’m no statistician.

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Here’s what people made!

And that’s it for the round-up for this month!

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Skills for the August Mastery Challenge

It’s August and that means that for those of you participating in the Mastery Challenge (and remember, you can opt in or out each month), it’s time to try out a new skill. This time around, we’ve got two skill options to choose from. You can either try Low Temperature Pasteurization or Steam Canning (or both). Let’s split them apart and dig into each technique individually.

What is Low Temperature Pasteurization?

Low Temperature Pasteurization (LTP) is a process in which you simmer jars of pickles in water that’s between 180 and 185 degrees F rather than process them in a boiling water bath. You do this for a longer period of time (typically 25-30 minutes). The longer, lower temperature allows you to kill off bacteria while retaining a firmer finished texture.

This technique is used primarily for pickles, as a way to retain a crunchier, firmer texture (though don’t get too excited. They still soften a little. But it’s better than pickles from a boiling water bath canner). The pickles are prepared just as you would for a boiling water bath process and are fully submerged in water for best heat penetration.

The trickiest bit of LTP is maintaining the proper temperature. I like to use an immersion circulator (as described in this post from last fall), but a reliable stovetop or portable induction burner will also do the trick. Just make sure to have a good digital candy thermometer that can clip onto the pot on hand to keep tabs on the temperature.

Currently, this process has only been tested on cucumber pickles, but adventurous canners might also try it on hot peppers (similar pH to cucumbers) or green tomatoes (lower pH) to create more textural finished pickles.

For more on this process, I recommend reading this piece on Healthy Canning and this one on The Babbling Botanist.

What is Steam Canning?

Before we dig in, let’s address the elephant in the room. Some of you might be thinking, “hey, isn’t steam canning a prohibited technique?” Well, for the longest time, steam canning wasn’t a process that was recommended by canning experts. This wasn’t because it was necessarily unsafe, but instead because there wasn’t funding available to do the research necessary to determine its safety. However, thanks to research done at the University of Wisconsin, it has been determined that it is now safe to use under certain circumstances.

Steam canning (also sometimes known as atmospheric steam canning so as to differentiate it from pressure canning, which also uses steam), is a process in which jars are enclosed in a large pot that contains a few inches of water and is in possession of a tight-fitting lid. The water is brought to a boil, which produces steam. The steam reaches 212 degrees F (same as the water would), and the jars are duly processed.

You typically see two different kinds of steam canners. There are those that look like old-fashioned cake tins, with a shallow base and a large domed lid. The second type looks like a traditional boiling water bath, but has a rack designed to elevate the jars and a thermometer in the handle, allowing you to see when the interior of the pot has achieved the proper temperature.

The benefits of steam canning are that you don’t need to use as much water (great for drought-stricken areas), you don’t need to keep your burner at full blast (once you’ve built up a head of steam, you don’t need as much heat to maintain it), and because you’re working with less water, it takes less time and energy to reach the proper temperature.

Steam canning can be used for any high acid preserve, provided it is processed for 45 minutes or less. Any longer and you run the risk of boiling the water reservoir dry, which isn’t good for your preserve or your cookware.

For more on steam canning, read this piece from the University of Wisconsin Extension, this article from Healthy Canning, and this one from canning doyenne Linda Ziedrich.

Recipes

I’m not going to recommend recipes this month, because the field is pretty wide open. You can do a small assortment of pickles with LTP and an almost endless array of recipes with steam canning. Try applying one of these techniques to an old favorite, or test drive them with something new and delicious. The choice is yours!

To be included in the monthly stats and round-up, please submit your finished project by Wednesday, August 30 using this form.

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Low Temperature Pasteurization + Crab Boil Pickles

cafe-du-monde

I have spent the last five years working as an independent, creative person. One of the things I’ve learned about myself in that time is that my path towards getting things done is shaped like a snail shell, with the product at the center and the track towards it running in a spiral shape.

grasshoppers-in-new-orleans

I orbit around the goal for days, weeks or even sometimes for months until I final land on the thing in the center. This is the process I take whether it’s a small project or a large one and people who know me understand that when they ask me how something is going, my response is often along the lines of, “I’m getting closer.”

zatarains-silo

The reason I’m sharing this with you today? This blog post is one I’ve been circling around for a very long time. I first started thinking about low temperature pasteurization for pickling six or seven years ago. A tool to accomplish it effectively (the Anova Precision Cooker) came into my life more than two years ago.

And the recipe I’m sharing at the bottom of this post was directly inspired by a press trip I took to New Orleans with the folks from Zatarain’s back in January (nine months).

zatarains-products

Finally, it’s all come together and I’ve landed on center of the circle.

The story starts with low temperature pasteurization. For many people, this approach is the answer to the question, “How can I make crunchy, shelf stable pickles?” It is preservation technique in which you simmer your filled jars in water that’s between 180 and 185 degrees F.

You do this for a longer period of time (typically 30 minutes) than you would normally process them in a boiling water bath canner. The longer, lower temperature allows you to kill off bacteria while retaining a firmer finished texture.

immersion-circulator-processing-set-up

Now, the trick to low temperature pasteurization is finding a way to maintain the proper temperature over an extended period of time. I have tried it on my ancient electric stove, but found that it was nearly impossible to consistently hit and sustain the target range.

Now, here’s where the Anova Precision Cooker comes in.

bushel-of-pickling-cucumbers

Several years ago, various companies started making immersion circulators for home use and the thought occurred to me that it would be the perfect tool for low temperature pasteurization. The reason being that immersion circulators are designed for sous vide cooking, a process in which you bring water to a certain temperature and then hold it at that temperature for an extended period of time to fully cook various kinds of food without overcooking them.

cucumbers-in-a-colander

Two years back, the folks from Anova got in touch and asked if I’d be interested in trying one of their immersion circulators. Thinking about low temperature pasteurization, I said yes. They sent me the unit, and then life got the better of me. I moved it from corner of the apartment to another for nearly a year, and then finally tucked it into my closet, forever promising myself that I would eventually use it for processing pickles.

washed-pickling-cucumbers

That brings us to 2016. Back in late January, I went on a press trip to New Orleans to learn more about Zatarain’s. Before that trip, all I knew about that iconic brand was the fact that they sold boxed rice mixes. While on the trip, I discovered that Zatarain’s is synonymous with New Orleans food. Never before had I encountered a brand that was so interwoven with the food culture of a place.

sliced-cucumbers-in-jars

It was a magical trip and I came away feeling moved by the welcome of the city and motivated to devise a cucumber pickle recipe that employed the Zatarain’s Concentrated Shrimp and Crab Boil flavoring. The reason for the recipe idea was this. They told us that originally, people would flavor their crab boil with packets of pickling spices. Over time, they’d created the concentrated liquid flavor out of a blend of extracted oils from those classic pickling spices.

zatarains-crab-boil

Always dreaming up preserving recipes, it seemed obvious that I should make a pickle using the liquid flavor, if for no other reason than it would create a classically flavored pickle without the mess of the whole spices.

finished-jars-of-crab-boil-pickles

So, that brings us up to mid-August. I was home between book events and was determined to finally make my crab boil pickles, and preserve them using the low temperature pasteurization process, facilitated by the Anova immersion circulator. I went to Reading Terminal Market, intending to buy 10 or 15 pounds of pickling cucumbers, and ended up coming home with a bushel (it weighed nearly 50 pounds).

so-many-pickles

I proceeded to make a lot of pickles. I made horseradish pickles. I make classic garlic dills. I cut them in spears, coins, and halves. All in all, I made nearly 30 quarts of pickles, thanks to an idea, a tool, a trip, and a little bottle of crab boil seasoning.

I realize that cucumber season is done for most of the country at this point, but since I finally managed to pull these things together experientially, I wanted to get this blog post written in this calendar year (and plant the seed that if you value crunchy pickles, perhaps an immersion circulator should be on your holiday list this year).

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