Place Cajun seasoning in a large plastic bag.

Cut the steak into 1-inch cubes.

Place steak cubes into the bag with the Cajun seasoning.

Seal the bag and shake well to coat the steak.

Heat oil in a frying pan over high heat.

Brown the steak cubes in the hot oil.

Thinly slice celery, carrots, and onion.

Place the sliced vegetables in the crock pot.

Add the browned steak to the crock pot.

Season with salt and pepper.

Pour beef stock over the meat and vegetables in the crock pot.

Stir all ingredients together to combine.

Cover and cook on low for 6-8 hours.

Optionally add dumplings for the last 15 minutes of cooking.

Serve the steak and vegetables.

Garnish each serving with a tablespoon of sour cream or creme fraiche and a sprig of parsley.