Before opening the cans of coconut, shake gently (this will make them easier to pour out as the fat and water tends to separate). Combine the coconut milk and sugar in medium saucepan. Place over medium-low heat and stir continuously until the sugar has completely dissolved.
Transfer the coconut mixture to a large heatproof bowl and stir in the vanilla paste (or vanilla extract, if using). Allow mixture to cool to room temperature before transferring to the fridge. Chill until very cold.
Pour the mixture into an ice cream maker and churn according to the manufacturer’s instructions. Transfer sorbet to a container - layered or folding in the orange marmalade. Cover the surface and freeze for a minimum of 6 hours or preferably overnight before serving.