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 - Using a potato masher or immersion blender, gently mash the apples, ensuring some small chunks remain for texture.
03 - Add granulated sugar, brown sugar, cinnamon, nutmeg, allspice, and salt. Stir thoroughly until sugars are fully dissolved.
04 - Stir in the butter. Continue cooking on medium, stirring frequently, for 20–25 minutes until the mixture thickens and reaches a golden caramel color. Scrape the bottom regularly to prevent scorching.
05 - Increase the heat and bring mixture to a boil. Add liquid pectin, stirring well. Boil hard for 1–2 minutes, then remove from heat.
06 - If needed, skim off any foam. Using a ladle, transfer hot jam to sterilized jars, leaving 1/4-inch headspace. Wipe jar rims, apply lids, and process in a boiling water bath for 10 minutes or as necessary for your elevation.
07 - Allow jars to cool completely. Store in a cool, dark location. Refrigerate after opening.