Place the sliced pineapple in a mixing bowl.

Add the brown sugar and cinnamon, then gently toss until the pineapple is evenly coated.

Heat the butter or oil in a skillet over medium heat.

Once hot, arrange the pineapple in a single layer and cook for about 4 minutes per side, or until caramelized and golden brown.

Serve warm on its own or paired with ice cream.