Looking for a white creamy steak sauce recipe?

I was at Ruth's Chris Steakhouse a couple weeks ago and I ordered a chef's special. It was a small fillet with lump crab on top and it was served with some creamy white sauce you could pour on top. I want to say they called it some kind of Imperial Sauce but I can't say that for sure, probably got it confused with another restaurant. Anyways, does anyone know where I could find a similar recipe for that sauce?Looking for a white creamy steak sauce recipe?
HOUSE DRESSING



24 oz. mayonnaise

2 oz. milk

1 tsp. white vinegar

1/2 tsp. Worcestershire sauce

1 oz. Parmesan cheese

1 oz. oil (oil and garlic must be blended together)

3 oz. sour cream

1 tsp. coarse ground pepper

1 tsp. steak sauce

1 tsp. dry mustard

1 clove garlic, chopped



Mix together vinegar, steak sauce, Worcestershire sauce, dry mustard and Parmesan cheese. Strain the oil into the mixture. Add mayonnaise and blend together, and finally, add the sour cream and milk. 1 quart.Looking for a white creamy steak sauce recipe?
Hmmm it depends if it tasted like gravy or not.