To begin, preheat your oven to 350 degrees Fahrenheit.

Unwrap the pre-cooked spiral ham and place it in a large, oven-safe casserole dish.

Open the can of pineapple slices and generously arrange them between the slices of ham.

Pour the juice from the can of pineapple slices over the ham and pineapple.

Sprinkle the brown sugar evenly over the pineapple slices and ham. Rub the ham with Dijon mustard. You can adjust the amount of brown sugar to suit your sweetness preference. The sugar will caramelize during cooking, creating a delectable crust.

Cover the ham with aluminum foil, ensuring that it’s tightly sealed. This will help trap the moisture and flavors as the ham slow-cooks.

Place the casserole dish in the preheated oven and let it cook for approximately 1.5 hours.

The exact cooking time may vary depending on the size of your ham, so keep an eye on it. The goal is to heat the ham through and allow the flavors to meld.

Periodically check the ham and baste it with the delicious juices that collect in the dish. This step ensures that your ham stays moist, flavorful, and beautifully glazed.

If your ham came with a glaze package, you can elevate the flavors even further. Mix the glaze with a few tablespoons of the pineapple juice, creating a luscious glaze. Brush this glaze over the ham for an extra layer of sweetness and shine.

Once your ham is done, remove it from the oven and let it rest for a few minutes. Then, slice it into generous portions, making sure to include the pineapple slices. Enjoy!