Gave up
I have been waiting for the last year for Yummy Soup for Mac and iPad to get a syncing solution that is easy and at the level ones expects for the year 2012 (i.e. automatic, seamless and invisible to the user). I gave up today and moved everything to Paprika. It is a shame, as yummy soup on its own is very nice, but these days it is the iPad I use for recipe notes in the kitchen and keeping the two in sync is more of a hassle than I am willing to put up with given the other options available.
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YummySoup!