Then mix sugar, syrup & mustard until well blended. Using a paring knife to make shallow even diagonal cuts across top of ham in 1 direction. Repeat making slits in opposite to form diamond shapes.
Then insert cloves where the cuts meet. Place the ham on a rack in a shallow baking pan. Place cherries,cut-sides down on surface of the ham.
bake the ham for about 2 hours or until ham is heated through. Make sure to brush occasionlly with 1/2 cup syrup mixture after 1-1 1/2 hours.
About 10 mins before ham is done, mix the remaining mixture with the cornstarch & pineapples in a sacue pan & bring to a boil on mediu-high heat. make sure to stir constantly. Cook & stir on medium-low heat for about another 5 mins or until thickened.