Needed for prime rib

I get some plain old sour cream, Add prepared horseradish until you like the bite and then season with a little garlic salt. That's it and super easy.

And black pepper.

you will never find hotter...

3 Parts sour cream, 1 part Hellmanns, 1 part horse radish, a squirt of lemon juice, and I like to add a little heavy crean to adjust the texture. I usually give it a dash of sugar.
The amount of all ingredients can be modified to suit your taste.

You can buy all the stuff to make this...

1 cup sour cream
1/4 cup grated fresh horseradish
1 tablespoon Dijon mustard
1 teaspoon white wine vinegar
1/2 teaspoon kosher salt
1/4 teaspoon freshly ground black pepper

Or you can spend a couple of bucks and buy a jar of Inglehoffer Cream Style Horseradish and save yourself the time and hassle of making it yourself.

Where is it available?

Sprouts has it for sure. It will clear the hair from your nose.

16 oz. Sour Cream
16 oz. Prepared Horseradish (drain liquid)
1 tsp. Garlic Powder
1 tsp. Onion Powder
1/2 T. Worcestershire
1/2 T. Salt
1 T. Pepper
2 T. Dried Parsley Flakes

Best if you let it set for a few hours.