Corned Beef Sauce

This corned beef sauce recipe comes courtesy of my grandmother Icsis. It is really simple to make, I remember helping my grandmother to make it when I was about 8. My husband Steve likes corned beef, (well he really isn't a huge fan of boiled anything) but says that after having corned beef with this sauce won't eat it any other way. Enjoy and happy St. Patrick's Day.
Ingredients
1 cup of corned beef liquid cooled (the water the corned beef is cooked in)
1 tablespoon plain flour
1 tablespoon of sugar
1 teaspoon of mustard powder
1 tablespoon butter
1 egg
2 tablespoons cider vinegar

1. Put all ingredients into a food processor, blend until well combined.
2. Place liquid into a saucepan on medium heat until it has thickened to a sauce consistency, stiring often.
3. Place in serving dish and enjoy over the top of corned beef or on the side