Coat inside of crock pot with non-stick cooking spray
Place ham, cut side down into crock pot
In a small saucepan, melt butter
Remove from heat and stir in brown sugar until well combined and a paste forms
Sprinkle ground cloves on top of brown sugar mixture in pan, stir to combine well
Cover ham with brown sugar mixture gently pushing mixture into ham
Add pineapple slices on top of ham, secure with toothpicks if necessary
Pour reserved pineapple juice over ham
Add lid to crock pot if possible, if the lid doesn’t fit, cover tightly with foil
Cook on low for 3-4 hours or internal temperature 145 degrees F
Baste with juice and let set for 10 minutes before cutting
Serve immediately
Store leftovers in refrigerator in airtight container