Right on this dukan diet you are allowed one fruit for the first initial phases, RHUBARB, what a lifesaver and a delicious ingrendient! I am sure not everyone is a fan as it does have a tendency to be rather bitter.
In my recipe I am not using any regular sugar, I am chopping up the rhubarb that I have which was approx 250g, adding a small amount of diet doctor pepper about half a cupfull will do. and 3 tablespoons of agave syrup and a few drops of rose water.
There are so many different brands of the above mentioned and they can be purchased in a few stores, they are perhaps not the most common of products, but you can always check them out on the links below so you know what you are looking for.