Place everything in a pan over a moderate heat and let it all bubble away merrily, the vibrant red berries will start to pop, keep stirring with a wooden spoon giving the berries a gentle crush for about 10 minutes. Check for sweetness adding a little more sugar if needed. Cool and refrigerate until needed.
It's worth mentioning that the sauce may look a little runny after cooking, but as the fruit cools it will thicken immensely from the pectin-rich fruit.
Remove from the fridge a hour before serving, give it a good stir through and serve in a groovy festive bowl.