Wash all the fruit and drain in a colander. Hull the strawberries and cut in half if they are very large. Put all of the fruit into a bowl. In a separate bowl combine equal parts of yoghurt and creme fraiche. Mix well to combine. Now cover the fruit with the yoghurt and creme fraiche mixture until all the fruit is hidden and smooth out with a knife or palette knife. Sprinkle an even layer of brown sugar over the yoghurt. Allow this to sit (it will sit happily in the fridge overnight) for about half an hour. The sugar on top will dissolve and will look like the top of a creme brule. Serve into bowls.
You can see from the photo that I've used bananas as well as strawberries in this particular version. If using bananas make sure the yoghurt topping covers them well so that they don't oxidise, ie turn brown. And here's a picture of the very yummy topping going all gooey and scary.....it looks a bit like an alien rising out of your bowl, but don't worry it still tastes great.