Mix orange juice, multivitamin juice or cherry juice with the pudding powder, pour into the micro jug and cook in the microwave for 5 minutes at 600 watts. Stir and add the sugar. Put the micro jug in the microwave again for 2-3 minutes at 600 watts. Let cool for 10 minutes and fold in the mascarpone and orange slices. Serve in small bowls, decorate each with a small piece of orange.