Untested - Rhubarb Mus

Apparently a Mennonite dessert/dessert topping, I'd never heard of it, but I'm very curious to try it. I suspect that, in spite of the rhubarb, there may be too much sugar.
Here is my source:
http://hippyinthekitchen.blogspot.ca/2013/03/rhubarb-mus-cherry-moos-pluma-mus.html


4 cups diced rhubarb
1 cup raisins
4 cups water
1 cup sugar
2 Tbsps. flour
1 cup heavy cream

1. Bring the water to a boil and cook the rhubarb with the raisins until it's tender.
2. In a separate bowl mix together the sugar and flour, then whisk in the cream.
3. Add the mixture to the cooked rhubarb and raisins and continue cooking until it thickens.
4. Serve warm or cold. I could imagine this being delicious on a simple white cake or dipping shortbread in it.