Preheat a grill to high. Whisk the mustard, olive oil and Worcestershire sauce in a small bowl. Season the steak with salt and pepper, then coat with half of the mustard mixture; let sit at room temperature 10 minutes. Combine the sour cream and chives in another small bowl and season with salt and pepper; refrigerate until ready to use.
Transfer the steak to the grill and cook 5 minutes; flip, brush with half of the remaining mustard mixture and cook 5 more minutes. Flip again and brush with the rest of the mustard mixture; cook 5 to 8 more minutes for medium rare. Transfer to a cutting board and let rest.
Meanwhile, bring a large pot of water to a boil. Add the pierogi and cook as the label directs. Put the spinach in a colander. Drain the pierogi in the colander with the spinach so the spinach wilts. Return the pierogi and spinach to the pot and stir in the butter; season with salt and pepper.
Slice the steak against the grain; divide among plates along with the pierogi and spinach. Top the pierogi with the chive sour cream.
Tools You May Need
Photograph by Justin Walker
Courtesy of Food Network Magazine
Tools You May Need
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