Add cream, milk, sugar, extracts and salt to a saucepan over medium heat. Stir constantly until the sugar dissolves, making sure not to let it stick to the bottom. Continue to heat until the mixture becomes warm and begins to bubble around the edges. Remove from heat. Add the mascarpone to a bowl and whisk until creamy. Pour the warmed milk mixture over top and whisk continuously until the mascarpone melts into the milk – it will separate at first but continue to stir until it all comes together. Refrigerate until cold, at least 60 minutes.