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Heat the rum in a small pan over a low heat with 50ml water and stir in the sugar until it dissolves. Turn the heat up to medium and bring to the boil. Boil for 2-3 mins until the mixture thickens slightly. Remove from the heat. Stir in the spices. Mix the crème fraîche with the lime zest and juice in a separate bowl.
Arrange the coals on one side of the barbecue and light (or see tip below for cooking indoors). When the flames have died down and the coals are ashen, lay the pineapple wedges over the coals. Cook for 2-3 mins until char marks appear, then turn over.
Brush the pineapple wedges with the rum syrup and cook for 10 mins more, moving them around the grill using tongs so they don’t burn. When ready, they will be golden and soft. Remove from the barbecue, sprinkle with the chilli, if using, and serve with the lime crème fraîche.