Beat eggs with sugar and salt until stiff peaks form for 20 minutes, then add flour, mix and pour onto a baking tray. Place the cake in the oven and bake for 15 minutes at 180 ℃.
Blend the strawberries in a blender until they become a homogeneous mass, then boil them over low heat for 10 minutes. After that, cool it and add sour cream.
Remove the cake from the oven, cool it, cover it with strawberry filling and shape it into a roll. Leave it in the refrigerator for a while so that the roll has time to soak.