Brown sugar, pineapple slices in heavy syrup (juice works, but is messier), and cherries.
Score the top of the ham about 1/2" deep in a diamond pattern. Doesn't have to be perfect.
Firmly pack brown sugar on top of ham - about 1/2" to 3/4" thick.
Add pineapple slices, securing them in place with toothpicks.
Insert cherries inside each pineapple slice. If you have enough cherries, you can add them in the spaces between the pineapple slices. Secure with toothpicks.
Gently poor pineapple syrup/juice over the top. Replace brown sugar that slides off.
Baste the top occasionally with the glaze that accumulates in the bottom of the pan while the ham is baking.
To make clean up easier, line the pan with heavy-duty aluminum foil.