It’s a lot easier than you might think to make your own strawberry jam.
- 8 half-pint jars, metal lids, and metal bands
- 4 pounds strawberries, thoroughly washed and hulled
- 1 tablespoon lemon zest
- 5 tablespoons fresh lemon juice
- 1 tablespoon fresh thyme leaves (optional)
- 1 (1.75-ounce) box regular powdered pectin
- 7 cups sugar
- Prepare 8 half-pint jars, lids, and bands according to manufacturer’s instructions. Prepare boiling water-bath canner.
- In a glass pie plate, place strawberries, in batches, and crush with a potato masher. Using a liquid measuring cup, measure 5 cups crushed strawberries, 1 cup at a time, and transfer to a large nonreactive Dutch oven.
- Stir in lemon zest and juice, thyme if using, and pectin to strawberries until pectin dissolves. Bring to a boil over high heat, stirring often. Add sugar all at once, and return to a full rolling boil, stirring constantly. Boil for 1 minute. Remove from heat, and skim foam from jam.
- Ladle hot mixture into hot sterilized jars, leaving 1/4-inch headspace. Remove any air bubbles, and adjust headspace as necessary. Wipe jar rims with a clean, damp cloth. Immediately cover with lids, and screw on bands to fingertip tightness.
- Process in boiling water-bath canner according to manufacturer’s instructions for 10 minutes. Remove canner lid; let jars stand in canner for 5 minutes. Place jars on a clean towel on a counter to cool for 24 hours. Check seals. Refrigerate any jam that does not seal for up to 1 week.
- Package sizes of boxed powdered pectin will vary slightly from brand to brand. Any brand will work as long as it is regular (not no-cook or low-sugar) pectin.
Step 1: Always thoroughly wash produce before canning.
Step 2: Crush berries in a single layer using a potato masher.
Step 5: Skim foam from jam using a slotted spoon.
Step 6: Ladle jam into jars, and remove any air bubbles.
Step 8: Place jars on canning rack, and lower into canner. Bring water to a full rolling boil before starting to count processing time. Check seals after letting jars cool for 24 hours.
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