Drain pears, reserving 2 Tbsp. of the juice. Finely chop pears; set aside.
Pour reserved 2 Tbsp. pear juice into medium saucepan. Stir in peppers, onions and currants; cook on medium heat until vegetables are crisp-tender, stirring frequently.
Add 1/3 cup of the mustard mixture and the chopped pears; cook 10 min., stirring occasionally.
Mix cornstarch and vinegar.
Add to pear mixture; mix well. Cook 2 to 3 min. or until mixture comes to boil and thickens, stirring constantly. Cover and refrigerate until ready to use.
Place ham in shallow roasting pan; cover with foil.
Bake 1 to 1-1/2 hours or until ham is heated through (140F), uncovering and brushing with the remaining mustard mixture after 45 min. Slice ham.