Melt the margarine in a saucepan and mix it with the flour. If the mixture is too crumbly to add a little more margarine, if it is too runny, add a little flour. Pour the roux with water, vegetable stock and a little milk until the sauce is nice and creamy. Let simmer a little.
In the meantime, wash and chop the dill and peel and slice the eggs with an egg cutter. Then add the dill and eggs to the sauce, season with salt and pepper.