Clean the wheat, wash it and let soak for several hours in cold water. Boil in the same water over low heat until completely soft. Set aside about 1/3 of it, pass the remaining grain through a strainer and pour the wheat slush over it.
To the resulting boiling mixture, add the starch, diluted with a little cold water, the sugar and the set aside boiled wheat grains. Simmer the mixture on low heat to thickening, then add the raisins and rose water.