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Posts Tagged ‘canning’

So, You Want to Preserve Your Famous Salsa…

By Diane Wright Hirsch, MPH, RD

Extension Educator/Food Safety

canning tomatoesEvery year, about this time, I am spending time on the phone, talking people out of canning. Well, not exactly. I strongly encourage canning as a way to preserve summer tomatoes, peaches, apples and cucumbers (often as pickles). But, invariably I will answer the phone and on the other end of the line is someone who wants to can their FAMOUS salsa recipe (or pickles, or pesto, or peppers in oil). While I could write volumes on “What Not to Can”, salsa is the subject of this article.

The word “salsa” is the Spanish word for sauce. The Encyclopedia of American Food & Drink reports that the first mention of the term “salsa” appeared in print in the U.S. in 1962. As of 1991, they said, sales of salsa surpassed ketchup.

The origins of these sauces may be Aztec, when the traditional ingredients included tomatoes and chili peppers. But the creative cook can easily find recipes using a variety of ingredients such as beans, mangos, pineapple, grilled corn, avocado, or peaches. Historically, “salsa” was considered an uncooked sauce (salsa fresco or salsa cruda). But, in the interest of convenience, salsa is now most often processed in glass jars and found on the supermarket shelf next to taco shells, tortillas and refried beans (or in plastic tubs in the produce section).

Making and canning salsa in a commercial processing operation is one thing. Doing it at home is another.

Most salsa recipes are a mixture of low-acid foods (such as onions and peppers), with more acid foods (such as tomatoes). Often, there are additional acid ingredients that may include vinegar and citrus juices such as lemon, lime, or orange.

The types and amounts of ingredients used in salsa, as well as the preparation method, are important considerations in how a salsa is canned. Generally, acid foods (tomatoes, fruits) are safely canned in a boiling water bath canner. So folks may think that a tomato or fruit based salsa would also be safely canned in a water bath canner. However, once you add low-acid ingredients such as onions, peppers, black beans, corn, cilantro or avocado, the pH (measure of acidity) balance may be tipped to the low-acid side. At this point, the pH is likely at 4.6 or higher and the only safe way to can the product is in a pressure canner (to safely can in a water bath canner the product pH must be below 4.6).

If a salsa has enough low acid ingredients to render the final product, “low acid” by definition, then you run the risk of having a salsa that will support the production of deadly toxin by the Clostridium botulinum bacteria. Improperly canned salsas or other tomato-pepper combinations have been implicated in more than one outbreak of botulism poisoning. Follow these considerations for safe salsa:

Choose and use safe ingredients

The acid ingredients help preserve canned salsas and make them safe for water bath canning. Most often bottled vinegar or bottled lemon juice is used. Use only commercial and bottled products. An equal amount of bottled lemon juice may be substituted for vinegar in recipes, but do not substitute vinegar for lemon juice. This substitution will result in a less acid and potentially unsafe canned salsa. If the product is to “acidic” or tart for your taste, add a bit of sugar to offset. Do NOT cut down on the acid!

Tomatoes and/or fruit ingredients should be just ripe, free of cuts, rot, or mold. Do not reduce the quantity in the recipe. Overripe tomatoes may be too low in acid for safety. If green mangoes are called for in the recipe, do not use ripe mangos as they also may be too low in acid for safety.

Peppers, onions, and other low acid ingredients must also be added in amounts given in the recipe. An extra pepper might just throw you into the low acid realm…measure and count carefully.

Spices such as cumin, dried oregano, salt and pepper can be adjusted to taste. However, fresh herbs such as cilantro (a low acid ingredient) should be added according to the recipe. You can always add the fresh herbs just before serving for the freshest flavor.

Choose and use a safe recipe

The USDA/Extension mantra has always been, “Only use tested, science-based home-canning recipes from reliable sources like the National Center for Home Food Preservation and some equipment or home preserving ingredient manufacturers.” This is especially true for any acidified food like salsa or pickles. Then, follow the directions, ingredient list, and amounts listed in the recipe. Never add flour, cornstarch or other thickeners—this will have an effect on the processing time needed to heat the interior product to a safe temperature. Store opened salsa in the refrigerator once opened.

If you want to stick with a personal favorite recipe, there are two things you can do. Can a basic salsa and add additional ingredients (beans, corn, avocado) just before serving. Or, make your FAMOUS salsa and store it in the refrigerator for up to one week or freeze it for up to one year. Freezing will certainly affect the texture of your fresh salsa, so test out a small portion first to see if you like it.

For more information about making and preserving salsa, go to www.uga.edu/nchfp (National Center for Home Food Preservation). On that site you will find the fact sheet (some of the information in this article was from this fact sheet), Canning Your Own Salsa Recipe. Or contact the Home and Garden Education Center at ladybug@uconn.edu or 1-877-486-6271.

Getting Ready for Home Preservation Season

By Diane Wright Hirsch, MPH

Senior Extension Educator/Food Safety

As the end of June looms, back yard gardeners and farmers alike are beginning to see the fruits (and vegetables) of their labor. Already we are enjoying locally grown spinach, lettuces, herbs and other greens, peas, and perhaps locally grown broccoli and cabbage. Asparagus season is over, and strawberries, thanks to a later season, may be around for a few more weeks. But as we go through July, we can look forward to blueberries, summer raspberries, green beans, beets, cucumbers, peppers, and the holy grail of fresh sweet corn and field tomatoes. So far the growing season has been blessed with sufficient rain and good weather, crops are happy and will likely be very productive.

So, now is the time to begin preparations for safe home food preservation, whether you have a garden or a favorite farm or farmers’ market.

First, determine what method of home food preservation works best for you. Your choice may depend on your preference for the resulting product (frozen vs canned green beans, for example, are very different in taste and texture); your storage space; the tools or resources you have at your disposal (Canner? Pressure canner? Separate deep freezer? Refrigerator freezer only?); and, perhaps, the cost of the process. Since most folks think that preserving at home will save them money, a recent article from the University of Maine, The Cost of Preserving Food in Maine (https://extension.umaine.edu/publications/4032e/ ), might make a good read.

They looked only at the costs of energy (in Maine) and equipment used to preserve food as the cost of the food itself varies depending on where it is purchased. When freezing, the most expensive part of the equation is the freezer itself. After that, they factored in the cost of energy and the container, which in this case was a reusable container. One time use containers and freezer bags will add to costs. Freezing was estimated at 38 cents per pound of food.

The cost of pressure canning is $1.14 per pound, while using a water bath canner will cost approximately 73 cents per pound. The difference here is the cost of the canner. A pressure canner is over three times the cost of a water bath canning pot when amortized over 20 years. (Using these figures and assuming the cost of a pound of fresh tomatoes is $3.50, and 91% of the pound is useable, the cost of a pound of home canned tomatoes is approximately $3.92. The cost of a pound of commercially canned tomatoes is about 92 cents.*)

Finally, dehydration is a rather costly operation in this part of the world at 99 cents per pound. You must use an electric dehydrator to be successful as the climate (some heat, more humidity) will not allow us to use the sun alone.

The differences may not seem significant unless you are putting away large quantities of food. I had always thought that freezing was the most expensive option. Not according to this study. The efficiency of modern freezers has probably changed this.

Once you decide which method you will use, then start gathering your supplies. As someone who likes to procrastinate, local sources can get depleted over the course of the summer season. Online sources are more reliable as it gets closer to September.

If freezing:

  • If you need to purchase a freezer, keep in mind that a full freezer is more efficient. Buy only the space you need, do not overbuy. An upright is less efficient than a chest freezer, but I find it very easy to lose things in a deep chest freezer!
  • If you own a freezer, eat what you can out of your freezer to make room for the new crop.
  • Stock up on containers. Reusable are best. Make sure they are appropriate for the freezer. Some plastics will crack when frozen. Rigid containers stack more easily. If using freezer bags, again, make sure they are freezer and not simply food storage bags.
  • A permanent marker and freezer tape or labels are essential as well.

If canning:

  • Purchase a new or check the condition of your water bath canner. The water bath canner or large pot should be clean, have a lid, and a rack to hold the jars off the bottom. Be sure you can locate all the pieces and replace what might be missing.
  • Purchase a new pressure canner or, if you already own one, keep in mind that a pressure canner with a dial gauge needs to be tested yearly. Have that done now. We do pressure gauge testing here at the office (hirsch@uconn.edu) or call 203.407.3163. If you cannot make it here, you can send gauges to your canner manufacturer to be tested. That will take some time, so get it done as soon as possible. Be sure to check your gasket and other rubber parts to make sure they are not dried out or cracked. If they are, replace them. Make sure there is a rack to keep jars off the bottom of the canner.
  • Check your supply of jars, lids and rings. The sealing compounds on lids can dry up and crack. Check the date on the box. If older than two or three years, it would be best to buy new. If jar rings are rusty, you should replace them. Check your jars. If the rims are chipped or cracked, replace with new. A chipped rim will prevent a good seal from forming.
  • Find or replace your other tools: timers, spatulas, jar lifters, ladles, funnels, etc.

If dehydrating:

  • Purchase or check on your dehydrator to make sure that it is working and that you have sufficient racks or screens.
  • Purchase your storage equipment, whether it is freezer bags, canning jars or other air tight, food-safe containers.

Of course, when you get ready to can, freeze or dehydrate, be sure to make sure all of your equipment is cleaned with detergent and hot water prior to using. Follow instructions for preparing canning jars and lids.

Last, but not least, update your information regarding safe home food preservation. Check with the National Center for Home Food Preservation http://nchfp.uga.edu/. In addition to safe processing methods, they also have a blog that provides timely information and advice: https://preservingfoodathome.com/. The Ball Blue Book, generally recognized by Extension food safety professionals as safe, is updated regularly.

*Based on figures from USDA/ERS Fruit and Vegetable Prices, 2015

For more information on home food preservation, go to foodsafety.uconn.edu or contact the Home and Garden Education Center at ladybug@uconn.edu or 1-877-486-6271.

Fermentation Workshop

fermentation canning fermentation participant

We had a very enthusiastic group of participants at our fermentation workshop in North Haven on November 17th. Participants learned about food processing and safely, and are ready to tackle their own garden produce for enjoyment into the winter months.

UConn Students Learn About Canning

Pressure cooker workshop Pressure cooker2

UConn Extension‘s Diane Hirsch held a workshop for 12 students from the UConn Spring Valley Farm and the UConn EcoGarden Club as well as others. The focus was on pressure canning as the Spring Valley Farm students hope to purchase a pressure canner in the near future. Julia Cartabiano, the farm manager, made the arrangements so that we could use the kitchen at the Whitney Dining Hall. We canned applesauce that the students had made.