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Combine the milk, cream, rice, vanilla, sugar and lemon zest in a heavy-based saucepan. Bring gently to a boil, stirring continuously. Once bubbling, turn the heat to low and gently simmer for about 45 mins, stirring frequently to stop it sticking, until the rice is just tender. Lay a sheet of cling film directly on the surface of the rice, cool to room temperature, then chill until cold.
To serve, combine the syrup ingredients in a small pan. Melt together, then bubble until syrupy for 4-5 mins. Cool for a few mins while you loosen the chilled rice pudding with some single cream (it will have become more solid) – just gently stir in a splash at a time until it’s spoonable. Divide between serving bowls and top with some warm rum & raisin syrup.