Position an oven rack 4 inches from the broiler element and heat the broiler on high.
Arrange the pineapple rings in a single layer on a rimmed baking sheet. Blot dry with paper towels and then sprinkle with the sugar. Broil until the sugar is melted and browned, about 5 minutes, rotating the baking sheet as necessary for even broiling.
Meanwhile, mix the sour cream and lime juice in a small bowl.
Transfer the pineapple to serving plates, top with a dollop of the sour cream, and sprinkle with the macadamia nuts.
nutrition information (per serving):
Photo: Scott Phillips