Prepare Liver: Rinse the beef liver slices under cold water, then pat dry with paper towels.
Season: Season the liver slices with sea salt and optional black pepper.
Cook Liver in Slow Cooker: Place the liver slices in the slow cooker. Add 1/2 cup (120 ml) of clarified butter over the liver.
Slow Cook: Cover and cook on low for 4-5 hours, or until the liver is fully cooked and tender.
Blend: Transfer the cooked liver and any juices from the slow cooker to a blender or food processor. Add the remaining 1/2 cup (120 ml) of clarified butter. Blend until smooth.
Chill: Transfer the blended liver pâté to a container. Cover and refrigerate for at least 4 hours, or until firm.
Serve: Enjoy the grass-fed beef liver pâté.