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On the day before you want to serve them, boil 1 1/2 lb potatoes in their jacket.
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Peel the potatoes as soon as they are done, and press through a ricer or mash through a sieve; then cool them till the next day (not in the refrigerator, it will change the flavor) Next day peel and grate 1 lb potatoes.
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Put grated potatoes in a cloth and wring out as much liquid as possible.
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Add to the boiled potatoes.
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Knead into this the egg, flour, and salt.
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With floured hands shape into tennis ball sized balls.
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In a large pot bring salted water to a full boil.
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Put the dumplings into the water and boil 5 minutes, reduce heat to medium for and boil for 5 minutes more, reduce heat to low for and let simmer until done (dumplings will rise to the top when they are ready), about another 5 to 10 minutes.
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Remove from water.
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Caution, do not put a cover on the pot, the dumplings will disintegrate.