2

I've decided i'd prefer to make my own coffee and can it to have on hand when i'm in a pinch then get a bottle of cold brew at the grocery to store in the car.

I wonder if anyone else has experience with this or has suggestions/oversights that could easily be made.

Off hand I would think to sterilize the jar, add freshly made hot coffee which should be about 200°F directly to the jar, let it self seal. I do wonder if this going to be enough for the coffee to seal past being perishable both from quality and safety standpoint.

2 Answers 2

5

For safe home canning in a water bath, you need the contents to have a pH below 4.6. Coffee typically has a pH of at least 4.8, so you need to either add an acid to bring the pH down or use a pressure canner to process the jars.

Moreover, coffee is full of volatile compounds that degrade relatively quickly when exposed to air. Canned coffee would likely degrade quite a bit within a few weeks, unless you use a process more similar to how beer is bottled to prevent oxidisation.

I honestly think it would be less effort to make a big pitcher of cold brew once a week and keep in the fridge for coffee related emergencies.

2
  • 3
    +1. Also, while 4.8 is the theoretical upper limit, generally recipes are made for lower pH, so there is a bit of a buffer if something doesn't go exactly as planned. I doubt that people would like to drink coffee that is so sour.
    – rumtscho
    Nov 5, 2021 at 21:01
  • 1
    It sounds like this is a deep dive not worth the time for now. Maybe if I need a hobby. In my experience i've never had great canned coffee which i'm guessing suggests there are compounds even the best of canning methods haven't resolved degrading quality. For the time being I will just get canned coffee for when im in a pinch. Another idea might be to look into something designed to can/preserve acidic things that can remove/replace the oxygen.
    – BBS
    Nov 9, 2021 at 16:47
4

You do not want to chill hot coffee. Its quality degrades rapidly when you do this -- like within hours.

Instead, you should make a large jar of cold brew and freeze it. Frozen cold brew can be kept for months or years. Storing it at room temperature is not feasible; you'll notice that commercially sold cold brew is mostly sold refrigerated, and the handful of "shelf-stable" brands are pretty uniformly terrible (Trader Joe's, I'm looking at you).

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.