Preheat oven to 450 degrees

If using frozen pineapple, microwave until it is mostly thawed. Use the juice in the sauce.

In a medium bowl combine butter, brown sugar, salt, cinnamon and pineapple juice, if you have it. Add pineapple chunks and gently toss until well coated.

Pour pineapple mixture onto a large rectangular baking dish.

Bake 20-25 minutes, stirring half way through. The pineapple is done when it turns a rich golden color and begins to brown, but before it starts to blacken.