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Brown the onions and the spinach. Remove the veg. Melt the butter. Add the flour and the milk. Stir. Put the onions and spinach back in the bowl. Season.
Transfer the mixture to the ramekins. Break an egg on top. Line the bottom of the bowl with paper. Place the ramekins in the bowl. Pour in 200 ml of cold water.
Cooking time: 4 min.
Sprinkle the grated Parmesan over. Serve!