Clean, wash and cut the rhubarb into small (3-4 cm) pieces. Put them into a pot with 200 ml water, bring to a short boil and steam over medium heat for about 7 minutes. Sweeten with 100 g sugar.
Stir the starch and 75 ml water until smooth and bind the rhubarb with it. Boil up while stirring, ready! Serve warm or cooled down. Serve with vanilla pudding.