Place the ham in the slow cooker.
Make the Glaze:
In a bowl, mix brown sugar, honey, Dijon mustard, and apple cider vinegar (or orange juice). Stir until the sugar is dissolved.
Pour the glaze over the ham, ensuring it is evenly coated.
Cook:
Cover and cook on Low for 6–8 hours or High for 3–4 hours, until the ham is heated through and tender.
Baste with the cooking juices every hour for extra flavor.
Serve:
Remove the ham from the slow cooker, slice, and drizzle with the remaining sauce. Serve warm.
