01 - In a large heavy-bottomed pot, combine chopped apples, lemon juice, apple cider, and water. Bring mixture to a simmer over medium heat and cook, stirring occasionally, for about 10 minutes until apples are tender.
02 - Using a potato masher or immersion blender, lightly mash apples, leaving some small chunks for a textured finish.
03 - Add granulated sugar, brown sugar, cinnamon, nutmeg, allspice, and salt. Stir until sugars are dissolved completely.
04 - Stir in cubed butter. Continue to cook on medium heat, stirring frequently and scraping the pot bottom, until mixture thickens and develops a golden caramel color, about 20 to 25 minutes.
05 - Increase heat to bring mixture to a boil. Add liquid pectin, stir thoroughly, and boil hard for 1 to 2 minutes. Remove from heat.
06 - If needed, skim off any surface foam. Carefully ladle hot jam into sterilized canning jars, leaving 1/4-inch headspace. Wipe rims, apply lids, and process jars in a boiling water bath for 10 minutes, adjusting for altitude as necessary.
07 - Allow jars to cool fully at room temperature. Store jars in a cool, dark location. Refrigerate once opened.