Per serving
From Let'sEatGerman.com, posted for ZWT 6. Prep time does not include boiling eggs.
Fry the diced onion with the margarine, then add the flour, salt and the broth.
Cook this for 15 minutes.
Spice it with the mustard and some sugar.
Put the shelled eggs on a deep plate and pour the hot mustard sauce over them.
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