Sunday, September 4, 2011

Honeyed Plum Jam + Canning 101

The fresh summer produce here in California has been beautiful lately, but with school back in full swing, I know fall is just around the corner. Soon, my beloved summer fruit will have all but disappeared from produce aisles and farmer's markets. This year, instead of just mourning their loss, I decided to preserve my favorite summer flavors into homemade jams. This way, I can enjoy these vibrant flavors whenever I'd like, even in the middle of winter.

The idea of making and preserving jam used to scare me. As I considered tackling this project, I reasoned with myself that families had been canning and preserving their own food for years before manufacturers did it for them. Why couldn't I? As it turns out, my fears were unneeded. Making the jam itself was actually pretty easy. Sterilizing the jars and then processing the fresh jam in order to preserve it were the only daunting parts of the whole process. In retrospect, even those steps weren't that difficult; I was just fearful of doing something wrong and winding up with a spoiled jar of jam. Now I've realized, as long as you have a healthy respect for the preservation process and follow all instructions precisely, making and preserving jam is a very manageable and rewarding task.

All the effort and research that it took to produce this jam was totally worth it. When I look at my darling pint sized jars of preserved homemade jam, I'm as proud as a mama. And the taste! Well, the stuff you buy at the store has nothing on the complexity of a homemade jam. This honeyed plum jam was made with a combination of red and black plums, which is how I managed to get such a bright color in the finished product. I used blue agave nectar and orange blossom honey instead of refined white sugar to sweeten it. Why? Simply because they are less processed than white sugar, and I wanted my jam to be as natural as possible. What I like best about this homemade jam is the fact that it has a tartness to it. Yes, it is still sweet, but nothing like the sugary jams we're all used to from the store. This has a natural sweetness that's not overpowering. The jam tastes fresh and vibrant. It's a true testament to the plum itself with barely a hint of honey in the background.

Overall, my first experience with jamming was a giant success. So, what advice do I have for other first time jammers? First of all, be extremely familiar with the preservation process and then invest in the right equipment. I have listed all the necessary steps in order for you to properly preserve your jams; however, if you want to do some more research, I found Alton Brown's Good Eats episode on jam making and preserving to be very informative. You can easily find it on YouTube. I also really liked this website, put out by the University of Georgia. It not only explains the steps you need to take in order to preserve your jams, but it also lets you know why these steps are necessary. It includes recipes for a variety of jams and has a lot of other useful information. It's a wonderful resource.

As for equipment, you will need at least 3 pint sized or 6 half-pint sized mason jars -- the traditional kind with two part lids. They are typically sold in cases. I found a small case that included 4 wide-mouthed pint sized jars, which is all I want for now. Just to note, you can reuse mason jars and their rings, but you have to replace the flat lids every time you process them. These can be bought separately. You will also want to look for the following tools, which can often be found together in a canning utensil kit: a jar funnel, a jar lifter, and a magnetic wand for touching the sterilized lids. I found a kit at Target that included all of those items for about $10. Many other stores, including hardware stores, also sell canning equipment. I've seen more elaborate (and more expensive) kits that included a large canning kettle, mason jars, a rack to hold the jars, plus everything that I mentioned that was in my kit. This is a great option if you don't have a large enough pot (something over 10 quarts is fine for this smaller recipe; most canning kettles hold 20+ quarts).

My penultimate advice for first time jammers and canners is to be familiar with your recipe and the canning process before you begin. Read the recipe more than once. You want to be accustomed with each step to avoid being surprised or unsure of something mid-recipe. Lastly, choose a time to make your jam when you won't feel rushed. It took me a couple of hours to make from start to finish, but I started early in the morning when I knew I would have plenty of time to finish. It's important to give yourself a couple of hours of uninterrupted time to avoid that frenetic feeling of trying to finish under time constraints. Handling hot jars while pressed for time is not ideal...

I hope you consider preserving your favorite summer flavors into a jewel-like jam like this one. Smothered a top a biscuit, slathered on toast, or eaten straight from a spoon, how could you go wrong?

Honeyed Plum Jam
Adapted from Chef in You

Yield: about 2-3 pints of jam

2 lbs of plums, skins left on
2 tbsp freshly squeezed lemon juice
1 packet powdered fruit pectin, the "no sugar needed" variety
1/2 cup water
1/2 cup honey
1/2 cup blue agave nectar

1. Thoroughly wash plums in a colander and remove any stems. Cut the plums in half; remove the pits. Proceed to chop the plums, removing any brown or mushy spots as you go. You should be left with about 5 cups of chopped and pitted plums. Pour the lemon juice over the plums to help avoid any discoloration. [Note: The acid from the lemon is also essential in the jam-making process, so do not skip this step.]

2. Thoroughly wash all mason jars, jar lifter, tongs, funnel, magnetic wand, and any other equipment you will be using to make the jam in hot, soapy water. Rinse well and place everything except for the top part of the lids in your largest pot or your canning kettle. Cover everything with water by 1-2 inches. Bring to a boil. Boil for 10 minutes to sterilize and then turn off the heat. Wait about 5 minutes after you turn off the heat, and then add the lids. Leave everything in the covered pot until ready to use. [Note: The top part of the lids cannot be placed in the pot for the sterilization process because the heat will melt the sealing compound, thus rendering the lid useless. The screw-top rings can be placed in the kettle for the full boil.]

3. Meanwhile, as the equipment is being sterilized, combine the plums soaked in lemon juice with the pectin in a heavy-bottomed pot and place over medium to medium-high heat. As they cook, the plums will slowly begin to generate their own liquid.

4. Once the plums become a little mushy, about 5 minutes, stir in the 1/2 cup water. Stirring often, cook the plum mixture until it comes to a boil.

5. Once the mixture boils, add the honey and agave nectar. Mix thoroughly. Remove any foam that forms on top of the mixture. Cook for another 10-15 minutes, stirring at regular intervals until it thickens into a syrupy consistency and reaches another boil. Cook for one full minute while at a rolling boil. Turn off the heat. [Note: During this final stage, if the plum segments are too large and have not reached a jam-like consistency, use a potato masher to help break them up further.]

6. Carefully remove all tools from the canning pot first, placing them on a clean towel. As you begin to remove the jars with the jar lifter, tilt them over the pot to let all the water drain out. Place the jars on the clean towel as well. [Note: If you have a granite, marble, or any other heat sensitive counter top, place a large cutting board in between the counter and the clean towel in order to protect the surface from the very hot jars.]

7. Using the funnel, work quickly and carefully to ladle the hot jam into the hot jar. Leave about 1/4 to 1/2-inch space, called headroom, between the jam and the top of the jar. Repeat for remaining jar(s). Carefully wipe the sealing surface of the jar with a clean paper towel that has been dampened with hot water in order to remove any jam or sugar crystals. [Note: If you end up with one jar that is only half full like I did, it should not be processed; therefore, it should not be taken through the remaining steps listed below. Instead, let the jam cool in the jar, place the lid on it, and then store it in the refrigerator. Use within 2-3 weeks.]

8. Remove a lid from the hot water with the magnetic wand. Place the lid on a jar, being careful not to touch the interior of the lid with your hand. Once the lid is centered on the jar, screw the band over the lid until barely tight. Repeat with other jar(s).

9. Load the filled jars, fitted with lids, into the canning pot one at a time, using your jar lifter, and keeping the jars upright the entire time. Cover the jars with more water, if needed. Water should cover the jars by 1-2 inches of water. Cover the pot with its lid; turn the heat to its highest setting until it reaches a vigorous boil. Once the boil begins, process the jars for at least 5 minutes. [Note: More time is needed for higher elevation.]

10. When the jars have been processed in boiling water for the recommended time, turn off the heat and remove the canning pot lid. Wait 5 minutes. Remove jars from canning pot; use a jar lifter and keep jars upright. Carefully place them directly onto a towel or cake cooling rack, leaving at least 1 inch of space between the jars during cooling. Avoid placing the jars on a cold surface or in a cold draft. Also avoid touching them for at least several hours.

11. Cool jars upright for 12-24 hours while vacuum seal is drawn and jam sets up. Let the jars sit undisturbed while they cool. Do not tighten ring bands on the lids or push down on the center of the flat metal lid until the jar is completely cooled.

12. Once completely cool, test the jars' seal by pressing down on the center of the flat metal lid. If the lid pops up and down it has not formed a seal and is not preserved. Put any unsealed jars in the refrigerator and use within 2-3 weeks. If the metal lid is unyielding when pressed, then your jars have been preserved. Preserved jars of jam should last between 8-12 months. Label preserved jars with the date, and then store in a cool, dry place with the rings off.

Note: Please use common sense when it comes to consuming the preserved jam and discard it if it looks or smells off. Once opened, store in the refrigerator and use within 2-3 weeks.


  1. Love reading these posts. Admire your research done on canning, the jam looks so yummy!

  2. Sounds really good. I have been wanting to try canning for a while but was overwhelmed by the whole process. I just bought some pectin so I might have to try this soon.

  3. Thanks Sandra!

    Lindsey, I was overwhelmed by canning before trying it too. Once you do it, you'll see it's pretty easy. Let me know how it turns out if you try it.

  4. I love making jams! Have you seen the blue chair jam cookbook? Besides being beautiful i haven't made a jam I didn't love from it. I will have to try this jam for Charlotte she loves all things plums and prunes. :) cute blog! - Teka