My Version of My Friend Jon's Polish Stir-Fry and Pierogis Pot Stickers with Herbs and Sour Cream

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3 tablespoons softened butter

1 package frozen pierogis, potato filled dumplings -- any brand or variety

1 1/2 pounds kielbasa, cut in large slices on an angle

1 tablespoon vegetable oil, 1 turn of the pan

1 tablespoon butter

1 large red onion, quartered and sliced

1 1/2 pounds kale, trimmed and coarsely chopped

1 pound sauerkraut, drained

1 teaspoon ground mustard or 2 tablespoons prepared spicy brown mustard

1 teaspoon sweet paprika, 1/3 palm full

Salt and freshly ground black pepper

2 tablespoons chopped fresh dill or 2 teaspoons dried dill leaves

2 tablespoons chopped chives

A handful of parsley leaves, chopped

1 cup sour cream