This keeps forever!  If you want it thicker, whip the cream slightly, or substitute sour cream for 1/2 the cream and reduce vinegar by 1 Tab.  

Ingredients:

• 1 c cream
• 4 oz horseradish – extra hot (not the wimpy sauce)
• 1 Tab Dijon mustard
• 3 Tab apple cider vinegar
• 1/4 tsp white pepper
• salt to taste

Directions:

Mix it all together

Serves:  makes about 1 1/2 cups

Source: MLK