So I made blackberry jam, and I canned it, which I’ll talk more about at the bottom of this post.
Here’s the recipe I used (it was very simple). This is a standard jam recipe but it’s vegan and gluten free:
1. Go pick some blackberries. I got 300g. Blackberries grow wild on brambles.
2. Weigh them (and wash them thoroughly, throw out any bad ones).
If you didn’t get many (you need at least 200g really – that does an 8oz jar of jam, when you subtract the stuff that will burn to the bottom, but for lots, preferably 500g-900g), freeze them and wait for more to ripen, then pick/wash more.
3. When you’re ready to make jam, weigh all your blackberries together.
4. Measure out the same amount of golden granulated sugar (it’s a 1:1 ratio blackberries to sugar). Maybe other sugar types also work, I used golden granulated.
5. Put the berries in a pan with a big tablespoon of lemon juice (this will help preserve the fruit) and about 1/4 cup of water, and bring to the boil.
6. Simmer straight away for 15 minutes.
7. Add the sugar. It will take a lot of stirring and a lot of waiting to get it all to dissolve.
8. Once it’s dissolved, turn the heat up as high as you can and boil for 10-12 minutes, until the blackberry gloop reaches 105 degrees C (220F) which is the setting point. Don’t stir, but if you smell burning, it’s done.
9. Take off the heat, skim off any white froth from the top, and let it settle for a few minutes (you can put it straight in jars at this point but I wanted to check it had worked.
10. Put in (sterilized with HOT water) jars, seal them if you want to.
About canning, storage times and such:
I used these quattro stagioni jars in 8.5 ounce size, which I found for a good price on the shelf at Homesense (they’re one of those places that has different stuff each week), I liked them because they’re made to take the high temperature and they’re vacuum sealable for food safety (although one of mine didn’t seal) and they sell replacement lids (70mm or 2 3/4 inch is the size for the 8.5 oz jars, although that is NOT cheap for 2 jar lids, so I hope somewhere starts doing them cheaper). You can use any old jar for jam, but you should use a fresh lid each time because you can’t fully clean the lids, which is why I bought jars to use.
If you want to read about home canning in more depth to ensure you’re doing it safely, this free guide from the USDA is phenomenal (I’d start with this section). I highly recommend it for people thinking of canning (which means putting in jars – that confused me for a while) other garden produce, although I’m still undecided on what to do with my carrots when they’re fully grown.
If you vacuum seal the jar with the blackberry jam in it, and don’t open it again, it’s good for 1 year (the jars I linked to have specific instructions to seal them in hot water, I managed to follow them using a bucket as I didn’t have a big enough pot). If it doesn’t vacuum seal (the popper in the lid still pops up) it’s good for 1 month. When you open it, it’s good for 1 month.
Anyone else done any canning or jam making? Got a different recipe/method? Let me know in the comments!