Place the sour cream, heavy cream, horseradish, Dijon mustard, onion, lemon juice, and salt and pepper in a small bowl and stir well until it is well combined.
Notes
Horseradish sauce goes with so many things! My dad’s eyes always lit up when I served something – anything!- with horseradish sauce. It’s great with salmon, beef (think steakand prime rib in particular). It’s perfect with pork roast or pork tenderloin. And it’s excellent with leftover turkey from Thanksgiving or another meal. And when you make roast beef or turkey don’t miss the chance to save some and make a Dagwood of a sandwich. Layer this sauce with whatever meat you have left for slicing.