Blueberry-Thyme Jam

Blueberry jam was the first thing I ever canned, and it remains a beloved preserve. This version includes some fresh thyme, a twist that works just as well on a cheese board as on a PB&J.

1
Prep Time:
20 mins
Cook Time:
40 mins
Additional Time:
5 mins
Total Time:
1 hrs 5 mins
Servings:
24
Yield:
6 half-pint jars

Ingredients

  • 3 pounds fresh blueberries, crushed

  • 1 lemon, zested and juiced

  • 4 cups white sugar

  • 3 tablespoons fruit pectin (such as Sure-Jell®)

  • 1 teaspoon fresh thyme leaves

Directions

  1. Submerge 6 empty half-pint jars on a rack in a large pot of water. Cover and bring to a rolling boil, then reduce heat to low to keep jars warm until ready to fill.

  2. Tumble blueberries and lemon zest and juice into a wide, nonreactive 8-quart pot. Whisk together sugar and pectin in a small bowl, then stir into pot until combined.

  3. Bring to a vigorous boil over high heat. Reduce heat to medium-high; cook, stirring frequently and adjusting heat as needed to maintain a gentle boil, until volume has reduced by at least 1/3, 20 to 25 minutes. Stir in thyme after 18 minutes of cooking. Remove pot from heat and check for set.

  4. Working with one jar at a time, remove empty jars from canning pot. Using a wide-mouth funnel, carefully ladle jam into jars, leaving 1/2 inch for headspace. Use a clean wooden chopstick to work air bubbles out of jars. Check headspace again and add more jam if necessary to bring to 1/2 inch from the top.

  5. Wipe jar rims, apply lids and bands (not too tightly), and return jars to canning pot; cover pot and return water to a rolling boil. Process for 10 minutes. Turn off heat, remove pot lid, and let jars stand in the cooling water 5 minutes to help ensure a good vacuum seal.

  6. Move jars to a folded kitchen towel or wooden cutting board to cool completely before checking seals. Any unsealed jars should be refrigerated and eaten promptly. Store sealed jars in a cool, dark place. They are shelf-stable at least 1 year.

Cook's Notes:

Do not use low-sugar pectin.

Jams thicken as they cool, so they need to come off the heat when they're still a little runny. But to set up properly, they also need to cook long enough to reduce the fruit's water content, which concentrates the sugar and allows it to gel and bond with the pectin. My favorite way to check for set is the saucer test: Tuck a few saucers into the freezer before you start cooking. When your jam smells sweet and looks glossy and thick and nearly molten, take it off the heat. Spoon a little onto a chilled saucer, freeze it for 1 minute, then nudge the jam with your fingertip. If it has formed a skin on the surface that wrinkles when you push it, the jam is ready. If your finger slides right through, it needs another 1 to 2 minutes of boiling.

Nutrition Facts (per serving)

161 Calories
0g Fat
42g Carbs
0g Protein
Nutrition Facts
Servings Per Recipe 24
Calories 161
% Daily Value *
Total Fat 0g 0%
Sodium 1mg 0%
Total Carbohydrate 42g 15%
Dietary Fiber 1g 5%
Total Sugars 39g
Protein 0g
Vitamin C 6mg 28%
Calcium 4mg 0%
Iron 0mg 1%
Potassium 45mg 1%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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