|Milk||1 Cup (16 tbs)|
|Prepared mustard||3 Tablespoon|
Melt butter in small saucepan over low heat.
Stir in flour, salt and pepper.
Cook over low heat, stirring constantly, until smooth and bubbly.
Remove from heat; stir in milk.
Heat, stirring constantly, until sauce boils.
Boil and stir I minute.
Stir in mustard and horseradish.
Heat until hot.