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78 votes

What is the code for the rings stamped on the top of canned food?

There’s no hidden code in the rings, they are just there to stabilize the thin metal. A flat sheet is weaker and more flexible than one with ridges - the same reason why roof and wall metal is usually ...
Stephie's user avatar
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63 votes
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How can I get a very thick or viscous paste (e.g. caramel, ganache, thick mayonnaise) into small-necked squeeze bottles without heating it up?

What about a piping bag? Fill the bag with a spatula, pipe into the bottle.
moscafj's user avatar
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42 votes

Does cooking food inside a pressure cooker and then leaving it locked preserve it similar to canning?

When you take the pressure cooker off the heat, it's filled with high-temperature, high-pressure steam. As it cools, that steam condenses, leaving a vacuum. Pressure cooker valves are designed to ...
Sneftel's user avatar
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38 votes
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Why is a pressure canner needed when canning?

Physics stops you from heating up liquids that consist of mostly water to temperatures above (roughly) 100 C. The temperature of your heating element can be set higher, but neither the temperature ...
Stephie's user avatar
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35 votes

How can I separate the lid from a can that has a pull-tab/ring without flinging food everywhere?

For most of the removal, leverage rather than brute force will give more control, so you don't accidentally pull the last bit off. At the end while pulling gently on the ring, rock the lid from side ...
Chris H's user avatar
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34 votes
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What is the process of storing food in toothpaste'ish tubes?

Tubes like that are assembled with the bottom open (so at that point it's a cylinder, closed at the cap end), filled, and then folded and heat-sealed at the bottom. The filling is done with a rigid ...
Sneftel's user avatar
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32 votes
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Repackaging shelf-stable products

Exposure to germs is the problem, once you open these they are exposed and the clock starts. If you vacuum seal you are vacuum sealing the germs in with the food, and not taking steps to kill the ...
GdD's user avatar
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30 votes

Can a sealed jar be unsafe?

It's completely possible. Sealing by itself doesn't preserve the food, effective processing does, then the seal keeps it from regaining any microbes which could cause spoilage. If your food is sealed ...
GdD's user avatar
  • 76.7k
28 votes

What is the code for the rings stamped on the top of canned food?

While it is absolutely correct that the beads and panels in a can end add strength and rigidity, there can be encoded information stamped into the can ends, but it's probably not what you're thinking ...
gnicko's user avatar
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26 votes
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Canning with candles

The short answer is: No. The more elaborate answer is that certain bacteria are anaerobic and food needs to be heat treated to ensure it can be safely stored. Especial mention: Clostridium botulinum ...
BaffledCook's user avatar
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24 votes

Canning tomato sauce for the refrigerator

As you state, you have not followed any canning procedures, so you don't get any more storage time than the standard recommendation. Glass vs plastic doesn't matter. So, I would just recommend ...
moscafj's user avatar
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24 votes

Does this tinned food need to be cooked?

All tinned foods which are not dry (like flour or coffee grounds) have been sufficiently cooked and are safe to eat directly after opening. Once opened, leftover contents should be treated like any ...
Sneftel's user avatar
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24 votes

Can I cook with the olive oil from canned sardines?

Yes, you can use the oil for other purposes, although due to the strong fish aroma and taste it would probably best be used only in a fish dish. I frequently use the oil from anchovies to fry onions ...
Greybeard's user avatar
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23 votes

Can you can items using a deep frier instead of a pressure canner?

In theory, it may be possible to kill all of the contaminants inside your jars using a deep fryer. However, I would not call it "safe," since there is possibly more risk of getting hurt from ...
Esther's user avatar
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20 votes
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What to expect from canned bear meat?

Canned foods are by their very nature cooked once they're in the can. That's how they keep so well. It is possible to grill canned meat if you dry it first, and it may benefit from a little browning ...
Chris H's user avatar
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20 votes
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Why does processed meat contain preservatives, while canned fish needs not?

These are two different ways to preserve food. The canned salmon was boiled and then sealed into a can while it was still boiling sealed into a can and boiled under a specified combination of time ...
Anonymous's user avatar
  • 316
20 votes

Can you save canning jars after you've realized they've been improperly sealed for a month?

Food spoils, glass doesn't, so as long as the jars are cleaned thoroughly they are perfectly safe to use. If you are very concerned then you could sterilize them as well using a bleach solution, or by ...
GdD's user avatar
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20 votes
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Can you can items using a deep frier instead of a pressure canner?

That’s a nice thought, but physics make it impossible. It’s not about the external temperature, but about internal temperature, in the jars. The contents of the jar are (hugely simplified) water, ...
Stephie's user avatar
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19 votes

Does this tinned food need to be cooked?

As people have mentioned, canned meats are cooked as part of the canning process, so it’s safe to eat as is... but it’s not always ideal to do so. In many ways, it’s like a chicken hot dog right out ...
Joe's user avatar
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18 votes
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What do to with cans that you just dented?

If you just damaged previously unharmed cans and they don’t show signs of leakage, the cans should be perfectly safe, even if you store them at room temperature. The US Department of Agriculture ...
Stephie's user avatar
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17 votes
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Should I throw away a jar of olives that fizzed and bubbled upon opening?

Short answer: Yes, throw it away. Long answer: Bubbling, fizzing, pressure etc. indicates some kind of microbiological activity that is unwanted for properly canned food - canning should eliminate ...
Stephie's user avatar
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15 votes
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Should I sterilize new canning jars?

You should sterilize your jars and lids before every use. The dust that gets on them between uses and even in the box is enough to warrant sterilizing. It doesn't take long. Running them through a ...
Sobachatina's user avatar
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15 votes

Is the liquid inside the canned chickpeas meant for consumption?

It depends on what you’re making whether you want to use it or not. If you’re cooking something that just calls for chickpeas, you probably don’t want to use it. Especially if they tell you to rinse ...
Joe's user avatar
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15 votes
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Is the liquid inside the canned chickpeas meant for consumption?

Assuming you meant to ask a food safety question, otherwise this is a duplicate: The liquid in the can with your chickpeas is food safe; otherwise, there would be no way for the beans themselves to be ...
FuzzyChef's user avatar
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15 votes
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Is the stock in my unsealed jar safe?

If you had followed correct procedure and found the unsealed jars in a timely manner, (within 24 hours) you could use or freeze them. You did not, you waited 2 days. It is generally false that "...
Ecnerwal's user avatar
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14 votes

How can I get a very thick or viscous paste (e.g. caramel, ganache, thick mayonnaise) into small-necked squeeze bottles without heating it up?

Edited: Concerns were expressed about such items being suited for food use. I've added comments in the text on "Food Grade" items plus a note at the end. How can I get a very thick or viscous paste ...
Russell McMahon's user avatar
14 votes

Does cooking food inside a pressure cooker and then leaving it locked preserve it similar to canning?

The (old-fashioned Central European) pressure cookers I've worked with have outlet valves which in pressure cooking position let gas out (at defined pressure), but not in. These cookers do have an ...
cbeleites unhappy with SX's user avatar
13 votes
Accepted

Does this tinned food need to be cooked?

From Grab Grocery: Precooked beef luncheon meat with the addition of chicken essence in 340g preserved cans. Robert beef luncheon meat is a wholesome meal cooked and slaughtered as per halal dietary ...
Anastasia Zendaya's user avatar
13 votes

How can I separate the lid from a can that has a pull-tab/ring without flinging food everywhere?

This answer is not ideal, as it avoids the use of the pull-tab altogether: Use a regular can opener instead. No flinging of food involved!
Bort's user avatar
  • 461
13 votes
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Is this process of canning jars safe?

No, it is not. Diced tomatoes and tomato sauce can be low-acidity foods, Nearly all recipes call for adding an acid. Without adding an acid and proper processing of jars, you risk botulism and a few ...
FuzzyChef's user avatar
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