Rasstegai
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The dish was very popular in Tsarist Russia. In rasstegai the filling is not hidden in the dough, and rasstegai in Russian means "unfastened" pies.[1]
Another version: in Moscow, in the gypsy choir, the beautiful Katya sang very well the Russian song "Sarafanchik-rasstegaychik"; in honor of Katya, rasstegai became a very popular meal in taverns in Moscow.[2]