This traditional Concord grape jam recipe, requiring just grapes, sugar, and a touch of citrus, is incredibly easy to prepare and yields a profoundly delicious result that will bring smiles all around. Far superior to any store-bought version, it’s the perfect way to capture the seasonal goodness of Concord grapes.

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  4 pounds Concord grapes, stemmed
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  2 1/2 pounds granulated sugar
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  3 ounces (6 tablespoons) fresh lemon juice, strained
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  Very finely grated zest of 1/2 an orange, orange part only, avoiding the bitter white pith
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  1/2 ounce (1 tablespoon) fresh orange juice, strained

1. To prepare for testing the jam’s consistency later, place a small saucer with 5 metal teaspoons in your freezer.
2. Working carefully directly over a small nonreactive saucepan, use your fingers to gently squeeze the flesh from each Concord grape. Be meticulous to catch all the grape insides and juices in the pan. Set the empty grape skins aside in a separate large bowl.

   Pro Tip for Squeezing Grapes: To minimize splashing and make the process more efficient, try to keep the stem end of the grape pointed downwards towards the inside of the pot as you squeeze. This technique often helps the skins slip off more easily and keeps the juices contained.

3. Bring the grape insides and collected juices to a gentle simmer over medium heat. Cover the saucepan and cook until the pulp is thoroughly softened, which should take approximately 3 to 5 minutes. Immediately, using a fine-mesh strainer or chinois placed over the bowl of reserved grape skins, force as much of the softened pulp as possible through the mesh. Discard any remaining seeds from the strainer.
4. Add the sieved grape pulp, granulated sugar, fresh lemon juice, orange zest, and orange juice to the bowl containing the grape skins. Stir all the ingredients together thoroughly until well combined. Transfer this entire mixture to an 11- or 12-quart copper preserving pan or a wide, heavy-bottomed nonreactive pot. Bring the mixture to a rapid, rolling boil over high heat.
5. Continue to cook the jam, stirring very frequently with a heatproof rubber spatula to prevent any scorching, especially as the jam thickens. If the jam starts to stick to the bottom of the pot, slightly lower the heat. The jam is approaching doneness when it acquires a noticeably glossier sheen and will have a thicker, more luxurious appearance than it did initially. This stage usually takes about 20 to 30 minutes of boiling.
6. After approximately 20 minutes of cooking, begin testing the jam for doneness. To perform the test, remove the jam from the heat and carefully transfer a small half-spoonful to one of your frozen metal teaspoons. Place the spoon back in the freezer for 3 to 4 minutes. Remove the spoon and gently feel the underside; it should be neither warm nor cold. If still warm, return it to the freezer for another moment. Tilt the spoon vertically to observe how quickly the jam runs; if it’s reluctant to run, and if it has thickened to a consistency that is spreadable, it is done. If it still runs quickly, return the jam to the heat, cook for another minute or two while stirring, and repeat the test. Continue this process as needed until the desired consistency is achieved.
7. Once the jam is ready, promptly skim any white foam that has accumulated on its surface using a clean stainless-steel spoon. Carefully ladle the hot jam into your sterilized jars. Process the jars according to the manufacturer’s instructions for canning, or follow the “Refrigerator Jam Safety” note below for quick storage. Properly sealed jars can be stashed at room temperature for several months, ensuring you have a taste of autumn throughout the year.

Refrigerator Jam Safety & Jar Sterilization

For safe storage and enjoyment of your homemade jam, proper jar sterilization is crucial. Always use heatproof jars that have been thoroughly cleaned and sterilized. Here’s how to sterilize them:

• Wash jars and lids thoroughly in hot, soapy water.
• Rinse them well under running water.
• Option 1 (Dishwasher): Place the clean jars and lids through your dishwasher’s sanitize cycle.
• Option 2 (Boiling Water): Submerge the clean jars and lids completely in boiling water for 10 minutes.
• After sterilization, remove them carefully and allow them to air-dry completely on a clean rack or towel (do NOT towel-dry, as this can reintroduce bacteria).

Once your jars are sterilized and hot, fill them immediately with the hot jam, cap tightly, and refrigerate promptly, ensuring the temperature remains at or below 40°F (4°C). To maintain hygiene, always use clean utensils for serving – never double-dip! Refrigerator jam is best consumed within 2 weeks (or 7–10 days for lower-sugar variations). If any mold appears, discard the entire jar immediately; it is unsafe to taste or remove just the mold. For extended storage, you can freeze the jam for up to 3 months, ensuring you leave ½-inch headspace in each jar to allow for expansion during freezing. Always label and date your jars for easy tracking.

Tips for Perfect Jam Consistency and Flavor

• Select Ripe Grapes: The success of your jam starts with the fruit. Choose firm, fragrant Concord grapes that are deep purple in color. Ripe grapes offer the best flavor and natural pectin content, which is key to a good set.
• Don’t Skimp on Citrus: The lemon and orange juice/zest are not just for flavor; they provide essential acidity and additional pectin, both of which are critical for helping the jam set beautifully and balancing the sweetness.
• Use a Wide Pot: A wide preserving pan or pot is recommended because it allows for faster evaporation of excess liquid. This helps the jam thicken more quickly and efficiently, preserving its fresh fruit flavor and vibrant color by minimizing cooking time.
• Stir Constantly: As the jam cooks and thickens, it becomes more prone to sticking and scorching. Frequent, thorough stirring with a heatproof rubber spatula is essential to ensure even cooking and prevent the bottom from burning.
• Trust the Spoon Test: The frozen spoon test is a classic and highly reliable method for checking doneness. Don’t rush this step. It’s better to test a few times and cook a little longer than to end up with runny jam. Look for that reluctant, spreadable movement.
• Mind the Foam: While not all batches produce a lot of foam, skimming any white foam from the surface at the end will result in a clearer, more appealing jam.

Recipe Inspiration

This delightful recipe is lovingly adapted from the acclaimed The Blue Chair Jam Cookbook, a treasured resource for jam enthusiasts.

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