Preheat the oven to 300°F. Place the 8-9 pound boneless ham in a large, high-sided roasting pan.
In a small bowl, whisk together the reserved 3/4 cup pineapple juice , 3/4 cup light brown sugar, 1/4 cup maple syrup and 2 teaspoons smooth Dijon mustard. Set aside.
Poke the 20 whole cloves into the ham at equal intervals.
Arrange the 20 ounce can pineapple rings (10-12 pineapple rings) of the top of the ham, securing them with 10-12 maraschino cherries and a toothpick in the center.
Baste the ham once with liquid (you’ll baste throughout cooking).
Bake uncovered for 2 hours and 30 minutes, basting every 20 minutes. Internal temperature should reach 145°F.
Remove the ham from the oven. At this time you can "display" your pretty ham or go ahead and prepare it for serving.
To prepare for serving, remove the pineapple slices, cherries and cloves. Discard the cloves and toothpicks. Slice the ham and the baste slices with theremaining basting liquid and then serve with the pineapple and cherries on the side.
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