Place rice in a saucepan, pour in 2 cups of cold water and put on the fire. When the water boils, reduce the heat to low and cover with a lid. Cook the rice until done over low heat for 15 minutes. The result should be rice porridge.
While the rice is cooking, blend the strawberries until pureed. Add 1 tbsp. sugar and blend again.
Chop the walnuts with a knife or use a mortar. Leave some whole nuts for decoration.
Transfer the cooked rice into a measuring cup. Add the remaining sugar, cream and vanilla sugar. Beat everything with a blender until smooth. The consistency should resemble thick sour cream.
Add walnuts to the resulting cream and stir.
Next, take dessert molds and fill them with cream to the middle.
Fill the remaining space in the molds with strawberry puree. Garnish the dessert with a whole walnut and serve or let the dessert cool for 1 hour.