2 Tbsp sugar
1 Tbsp Edmonds standard flour
2 tsp mustard powder
1 cup water or corned beef cooking liquid
¼ cup malt vinegar
salt and pepper
1. Beat the egg and sugar together and put into a saucepan.
2. Whisk in the flour and mustard, then gradually add the water and vinegar.
3. Cook over a low heat until the sauce thickens, then season with salt and pepper to taste, adding more sugar if you wish.