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FrogManSometimesLooksBothWays Since he going for the sweet white, especially the Washington Riesling which is quite reasonably affordable, you should shock him with another German favorite which is more affordable in Iowa called Piestengel.
It's actually not a grape at all. Iowa Piestengel is a real affordable treat though. Plus you don't have to pay the import taxes for the more tart Riesling or Piestengel from Germany.
Few in the USA have ever heard of Piestengel much less tried it. I'm one of the few! To the best of my knowledge it's only made in one community on the eastern side of Iowa. Of course it's a German community.
At all cost stay away from the California Riesling. Yes it's not as sweet and far cheaper, yet it's atrocious. 😖