Add the ham to the slow cooker. Squirt over the mustard. Pat over the brown sugar. Now pour over the pineapple.
Cover and cook on LOW for 6-7 hours. Don't open the lid while it cooks, so heat doesn't escape.
Slice and serve with pineapple and juices.
Can I freeze the leftover ham?Yes, place the ham in ziplock bags, squeeze out the air. Freezer for up to three months. Thaw in fridge. Use in your favorite recipes.Can I use honey instead of brown sugar?Use 1/4 cup honey in place of the brown sugar for a different flavoring.My ham will not fit in my slow cooker! If your ham is too large, cut off the smaller end portion. Use that extra ham in a another recipe.