01 -
Add strawberries, honey, granulated sugar, lemon juice, and a pinch of salt to the slow cooker. Stir gently to incorporate all ingredients.
02 -
Cover and cook the mixture on low for 6 to 7 hours, stirring occasionally, until the fruit becomes soft and the mixture darkens and thickens.
03 -
Uncover and carefully blend the mixture with an immersion blender directly in the slow cooker until completely smooth. Alternatively, transfer in batches to a countertop blender and blend until uniform.
04 -
Continue cooking uncovered on low for an additional 1 to 2 hours, stirring occasionally, until the butter reaches a thick and spreadable consistency.
05 -
Stir in vanilla extract after cooking is complete, mixing thoroughly.
06 -
Allow to cool slightly, then transfer to sterilized jars for storage.
07 -
Refrigerate for up to 2 weeks or freeze for extended storage.