Corned Beef Gravy - cooking recipe

Ingredients

40 ml sugar
60 ml vinegar, any type seems to work
10 ml butter
100 ml water, reserved from cooking the silverside
5 ml mustard, dry powder
1 egg

Preparation

Mix all ingredients except egg in a saucepan over medium heat.
Whisk egg, then slowly add to warm broth.
Whisk mixture well, but do not boil.
Enjoy over silverside.