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1. Stir together sour cream and mustard; cover and refrigerate. Heat oven to 170 degrees F. Heat 12-inch skillet over medium-high. Coat beef with1 tablespoon oil; season with salt, pepper, and 1 teaspoon sugar. Brown in hot skillet 4 minutes,turning once. Transfer to platter; set aside.
2. Add remaining oil, carrots, and onion to skillet. Cook and stir 5 minutes, until browned. Add broth and potatoes; bring to boiling. Reduce heat; cook, covered, 15 minutes, until tender. Return beef to skillet. Simmer, covered, 8 minutes for medium (10 minutes for medium-well).
3. Reserving broth in skillet, transfer vegetables and beef to oven-safe platter; keep warm. Simmer broth; add spinach. Cook and toss with tongs 3 to 4 minutes.
4. To serve, ladle broth in bowls; reserve some to drizzle over meat and vegetables. Divide beef and vegetables among plates. Serve with mustard sauce. Makes 4 servings.