01 -
Place mashed sweet potatoes, apple juice, dark brown sugar, cinnamon, cloves, and ginger in a medium saucepan.
02 -
Set saucepan over medium-high heat and simmer, stirring frequently, until most of the liquid has evaporated, approximately 15 minutes.
03 -
If necessary, transfer mixture to a food processor and blend until smooth. Ensure the lid is vented to allow steam to escape.
04 -
Transfer butter to an airtight container and refrigerate for up to one week, or divide among sterilized jars for gifting.