Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C).
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Score ham by making 1/2-inch-deep diagonal cuts in a diamond pattern.
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Mix brown sugar with enough mustard to make a smooth, pourable sauce.
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Place ham into a roasting pan. Drizzle honey, reserved pineapple juice, and brown sugar mixture over top.
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Arrange pineapple rings decoratively on ham and secure with wooden toothpicks.
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Bake in the preheated oven, basting every 15 minutes with pan juices, until the diamond pattern on ham splits open, about 1 to 1 ½ hours.
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Serve and enjoy!
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