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Prepared this way, the jars have a shelf life of 18 months to 2 years, and require no special attention.
Now here's how you can, too!
You can use fresh or even frozen blueberries, but obviously you'll get the best price and freshest taste if you go pick your own. Typically, blueberries are in season in the US and Europe in June and July - check the harvest calendar for your state!
Now's a good time to get the jars ready, so you won't be rushed later. The dishwasher is fine for the jars; especially if it has a "sanitize" cycle, the water bath processing will sanitize them as well as the contents! If you don't have a dishwasher with a sanitize cycle, you can wash the containers in hot, soapy water and rinse, then sanitize the jars by boiling them 10 minutes, and keep the jars in hot water until they are used. Leave the jars in the dishwasher on "heated dry" until you are ready to use them. Keeping them hot will prevent the jars from breaking when you fill them with the hot blueberry pie filling.
Put the lids into a pan of hot, but not quite boiling water (that's what the manufacturer's recommend) for 10 minutes, and use the magnetic "lid lifter wand" to pull them out.
I'm sure you can figure out how to wash the fruit in a colander of plain cold water.
Then you need to pick out and remove any bits of stems, leaves and soft or mushy berries. It is easiest to do this in a large bowl of water and gently run your hands through the berries as they float. With your fingers slightly apart, you will easily feel any soft or mushy berries get caught in your fingers.
Then just drain off the water through a colander! A number of people have written to ask where to get the conical metal colanders that our grandmothers used - here's where:
It's pretty simple: place the blueberries (up to 8 cups at a time) in a large pot with at least 1 gallon of boiling water. Boil each batch 1 minute after the water returns to a boil. You're not really "cooking" the blueberries - just heating them up them by blanching. Blanching means heating them at high temperature for a brief time to stop the enzymes that can cause the flavor to degrade during storage.
Drain and keep the hot cooked fruit in a covered bowl or pot.
Photo is coming!!!
Mix 1/4 cup plus 1 tablespoon of ClearJel starch with the 3/4 cup of sugar in a large pot. Add the 1 cup of water or blueberry juice and heat on the stove until the mixture thickens and begins to bubble.
Then add the 3 and 1/2 teaspoons of lemon juice, stirring constantly.
Note: I use blueberry juice to add the flavor and natural sweetness, but you can just use cold water, as the blueberry juice can be expensive and hard to find.
ClearJelⓇ is a corn starch that has been modified to give it special and unique characteristics when used in food products. It is recommended by the USDA for making pie fillings because it does not break down in the acid food mixtures and does not thicken enough during heat processing to interfere with the intended effect of the heat on killing bacteria during canning. In other words it reduces spoilage and is safer than corn starch. It is preferred for thickening canned pie fillings as well as other foods over other corn starches because it has less or no aftertaste, the thickened juices are smooth and clear, and foods thickened with ClearJelⓇ may be frozen.
|Type of sweetener||Notes||Amount per 1 quart||Amount per 7 quart batch|
|Stevia||Stevia blends vary a lot in concentration and sweetness - just make it as sweet as you prefer.||1/3 cup||3 and 1/3 cups|
|Splenda||3/4 cup||6 cups|
|Blend (50-50 sugar and Splenda)||1/2 cup Splenda AND 1/4 cup of sugar||3 and 1/2 cups Splenda AND 3 cups of sugar|
|Blend (sugar and Stevia)||1/4 cup Stevia AND 1/4 cup of sugar||2 cups Stevia AND 1 cup of sugar|
|Honey||You need to thin the honey with some normal strength, not undiluted concentrate, fruit juice||1/2 cup of honey and 1/3 cup of cherry or grape juice||5 cups of honey and 1 cup of cherry or grape juice|
|Concentrated frozen blueberry or grape juice||Use undiluted||1 cup undiluted concentrated thawed from frozen||7 cups undiluted concentrated thawed from frozen|
|Agave||3/4 cup||6 cups|
|Other combinations: Of course, you can use of combinations of agave, fruit juice, honey, sugar and/or Stevia. It will be trial and error to find out what works best for you, as I haven't tested all possible combinations.|
Fold the berries into the hot liquid. Stir gently and constantly. WARNING: it gets thick really quickly, so don't overcook it, and if you need to add additional fruit juice or water to thin it out enough to be able to fill the jars.
Stir almost constantly while cooking on medium high heat until the mixture begins to bubble. It ought to be reasonably thick, but still able to flow.
IMPORTANT TIPS: Clear Jel thickens like you wouldn't believe; very fast and very thick. You have to move fast, and not overcook it or it will become too thick. If it does become too thick you can thin it with some water. Just add enough water to make it manageable.
Pretty self explanatory. A jar funnel helps. Gently jostle the jar to help it settle in the jar and reduce the amount of air space. Fill the jars to within 1 inch of the top, wipe any spilled blueberry pie filling of the top, seat the lid and tighten the ring around them.
Put the filled jars in the canner and keep them cover with at least 1 inch of water and boiling. if you are at sea level (up to 1,000 ft) boil pint and/or quart jars for 30 minutes.
If you are at an altitude of 1,000 feet or more, see this chart.
USDA-Recommended process time for Hot Pack Pint or Quart Jars of Blueberry Pie Filling in a boiling-water canner.
|Process Time at Altitudes of|
|0 - 1,000 ft||1,001 - 3,000 ft||3,001 - 6,000 ft||Above 6,000 ft|
Lift the jars out of the water and let them cool without touching or bumping them in a draft-free place (usually takes overnight) You can then remove the rings if you like, but if you leave them on, at least loosen them quite a bit, so they don't rust in place due to trapped moisture. Once the jars are cool, you can check that they are sealed verifying that the lid has been sucked down. Just press in the center, gently, with your finger. If it pops up and down (often making a popping sound), it is not sealed. If you put the jar in the refrigerator right away, you can still use it. Some people replace the lid and reprocess the jar, then that's a bit iffy. If you heat the contents back up, re-jar them (with a new lid) and the full time in the canner, it's usually ok.
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