place the sauce in a small saucepan and simmer over low to medium heat until it thickens, about 3 minutes.
...
mustard sauce ingredients:
- 1/4 cup chicken broth.
- 1/4 cup sour cream.
- 2 teaspoons dijon mustard.
- 2 teaspoons stone ground mustard.
- 1/2 teaspoon cornstarch.
- salt and pepper to taste.