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I'm not sure if it's ethnic or regional, but I grew up outside Chicago into a German family and we made them. I remember my dad rolling them out on the kitchen table and letting them semi-dry there. We would put them in chicken soup and they were delicious. His dad was a baker and his mom grew up in Germany, so either of those could be the source...
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I've never heard of them (not that I know everything) - so I'm voting for a regional term. (I've lived midwest, east coast, west cost, southeast . . . so I've heard of many regional things, just never slickers for food - slickers I know are a regional term for a rain coat)
will have to look them up.
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