Homemade Nectarine Preserve

Examine each of the five (½-pint) jars for any visible damage or signs of wear, specifically looking for cracks and rust on the rings. Discard any jars that are not in good condition.

Submerge the jars and their corresponding lids and rings into simmering water until they reach the desired temperature for jam preparation. Clean any unused new lids and rings with warm soapy water.

Accurately measure the finely chopped, peeled nectarines; you should have 4 ½ cups. Add these to a heavy pot and immediately combine with lemon juice, ensuring the nectarines do not turn brown.

Combine ¼ cup sugar and fruit pectin in a small bowl. Add this mixture to the nectarines in the pot; stir well to ensure everything is fully incorporated. Gradually bring the mixture to a full rolling boil that continues to bubble vigorously when stirred. Add the remaining 2 ¾ cups sugar and stir until it is completely dissolved, making sure to scrape the sides of the pot thoroughly. Boil for exactly 1 minute, stirring constantly throughout this time.

Remove the pot from the heat source and stir in almond extract.

Fill the prepared jars with jam, leaving a small gap of about ¼ inch between the top and the lid. Use a clean knife or thin spatula to gently remove any air bubbles that may have formed inside the jars. Wipe the rims of the jars with a damp paper towel to remove any spills or residue. Place the lids on top and tightly screw them onto the jars.

Position a rack in the bottom of a large stockpot and fill it halfway with water. Bring this mixture to a boil, then carefully lower the jars 2 inches apart into the boiling water using a holder. Pour in more boiling water to cover the jars by at least 1 inch, ensuring they are fully submerged. Continue to boil for 10 minutes.

Carefully remove the jars from the stockpot and place them on a cloth-covered or wood surface, leaving several inches of space between each jar. Allow the jars to rest for 24 hours without disturbing them.

Gently press the center of each lid with your finger to ensure it does not move up or down. Remove the rings for storage and store them in a cool, dark area.