Every culture has it's meat pies.
In a small bowl whisk together the egg yolks and the sour cream, add the sour cream mixture to the flour mixture, and blend the mixture until it just forms a dough, adding the water if the dough seems dry. Divide the dough into fourths, form each fourth into a flattened round, and chill the dough, each round wrapped well in wax paper, for 1 hour or overnight. Force the potatoes through a ricer or food mill into a bowl and stir in 1 tablespoon of the butter. In a heavy saucepan cook the onion and the caraway seeds in the remaining 1 tablespoon butter and the oil over moderate heat, stirring, until the onion is golden, add the cabbage, and cook the mixture, stirring, for 5 minutes. Cook the mixture, covered, over moderately low heat, stirring occasionally, for 5 minutes more and stir it into the potato mixture with the sour cream, the water if the mixture is too thick, the dill, and salt and pepper to taste.