01 - In a large heavy-bottomed pot, combine chopped apples, lemon juice, apple cider, and water. Bring to a simmer over medium heat and cook for 10 minutes, stirring occasionally, until apples are tender.
02 - Slightly mash apples with a potato masher or immersion blender, keeping some small chunks for texture.
03 - Add granulated sugar, brown sugar, cinnamon, nutmeg, allspice, and salt. Stir gently until sugars dissolve completely.
04 - Add cubed butter and continue cooking, stirring frequently, over medium heat for 20–25 minutes until mixture thickens to a golden caramel hue. Stir gently and scrape the bottom regularly to prevent scorching.
05 - Bring mixture to a boil. Stir in liquid pectin and boil vigorously for 1–2 minutes. Remove from heat immediately.
06 - Skim off any surface foam if needed. Ladle hot jam into sterilized jars, leaving 1/4 inch headspace. Wipe rims, apply lids, and process jars in a boiling water bath for 10 minutes. Adjust time for altitude if required.
07 - Allow jars to cool undisturbed. Store cooled jars in a cool, dark location. Refrigerate after opening.