Wash and clean the strawberries and finely puree them with the hand blender in a measuring beaker. Make up to 500 ml with the milk. Bring to the boil with vanilla sugar and sugar in a saucepan. Mix the cornstarch with a little milk until lump-free. Remove the pot from the stove and stir the starch vigorously into the strawberry mixture, then put it back on the stove and bring to the boil. The mass thickens immediately.
Now stir in the grenadine as you like and pour the pudding into dessert bowls that have been rinsed cold. Cover with cling film directly on the pudding so there is no skin.
Let it set in the refrigerator. The pudding is easy to turn over.