Yogurt Havarti White Sauce

Ingredients:
PART 1
2 T Margarine
2 T Flour

PART 2
1/2 c Yogurt
1/2 c Water
2 ts Sherry
1/8 ts Prepared mustard
1/4 c Havarti, crumbled
1/8 ts Salt
1/8 ts Pepper
1/4 ts (veg) Worcestershire sauce

Directions:
Heat the margarine and the flour for a few minutes, stirring.

Add everything else and cook, stirring continuously, until it has
melted, thickened and has a nice smell.