Break the broccoli into small florets. This is important, otherwise the thick base of the broccoli will not cook.
Blanch the broccoli for a few minutes in water with a little salt until the broccoli softens, but not too much! - it will continue to soften during baking.
Cut the purple onions into half rings and saute until early browning in canola oil.
In another bowl, 1/2 a container of mix sour cream, 1 container of cooking cream, 4 tablespoons flour and egg. Season with salt, pepper and nutmeg.