Set pot to sauté. Add the butter to melt, then add brown sugar. Add pineapple pieces and sauté for 3-5 minutes. Hit off and remove the pineapple from the pan.
Add water to pot and deglaze pan. Add rice and 2 cups of coconut milk, and salt. Lock on lid, set toggle to sealing, and set pot to cook for 3 minutes. Allow a 10 minute natural pressure release.
Open lid and set pot to sauté. Stir in remaining milk, sugar, vanilla and spices. Cook just until well mixed. Serve hot or cold, topped with the pineapple.