This is a quick sauce with horseradish, mushrooms, and sour cream that you can whip up in a few minutes to enhance steaks on the grill.
- Broil steaks.
- Cook onions and garlic in oil; when soft, add mushrooms.
- Combine stock and cornstarch.
- Add stock to skillet along with horseradish, thyme, and pepper.
- Bring the sauce to a boil and cook 1-2 minutes.
- Add the sour cream and remove from heat.
- Serve over steak.