Step 1

Season steak with salt and pepper. Heat oil in a large pot over medium-high heat. Cook steak in batches, turning, until browned, about 5 minutes. Transfer to a cutting board; cut into bite-size pieces.

Step 2

Add onions and vinegar to pot; cook, stirring occasionally, until onions are soft, about 5 minutes. Stir in tomato paste and spices; cook, stirring, 1 minute. Add broth and potatoes; bring to a gentle boil and cook until potatoes are tender, about 30 minutes.

Step 3

Return steak to pot, along with any juices. Cook until warmed through. Season with salt and pepper. Reserve half of stew for next day; serve remainder with sour cream, parsley, and more pepper.