Step-by-Step Instructions:
In a bowl, mix together sour cream, prepared horseradish, Dijon mustard, mayonnaise, and lemon juice.
- Stir the ingredients until well combined and smooth.
- Season with salt and pepper to taste.
- Refrigerate the sauce for at least 30 minutes before serving to allow the flavors to meld.
- Garnish with chopped chives when serving alongside steak.