Find a piece of breathable fabric that you like. (I used a mesh fabric with patterns on it.)
Measure and cut the fabric to the shape of the door or window you are covering.
Recipe for raw Sauerkraut:
1 head of organic green cabbage
1 head of organic red cabbage
2 tablespoons of grey sea salt per head of cabbage (or other sea salt)
Chop the cabbage finely, add salt and stir,...