Polish Cranberry Dessert - cooking recipe

Ingredients

1 lb fresh cranberries
1 3/4 cups water
1/2 - 1 cup granulated sugar (1/2 cup is tart)
1/4 cup potato flour or 1/4 cup cornstarch

Preparation

Boil the cranberries briskly in water until the skins burst.
edited: **I'm sorry it's been awhile since I made this -- I think you do use the water and berries -- you are just pushing them through a fine mesh sieve to discard the skins -- that's why I say I think you can use an immersion blender unless you don't want any skins -- 1/4 cup of cornstarch is a lot -- it makes it gel.**.
Press the cooked berries through a sieve. (I think you could use an immersion blender here, unless you don't want any skins.).
Return the puree/juice to the cooking pot and add sugar.
Mix the potato flour or cornstarch with a little water and stir it into the puree. Bring the mixture to a boil, reduce heat, and cook gently until it thickens.
Pour the thickened puree into a pretty bowl or dishes and serve chilled with whipped cream.