1/2 cup brown sugar, 25g butter & 100 ml cream.

1. to make butterscotch sauce, bring brown sugar and butter to the boil in a pot in a pot, taking care not to let it burn. Add the cream and continue to boil until sauce is a golden brown and thick.

Beat 1 egg with 1/4 cup of sugar until fluffy, add 1 tbsp of flour, 1 tsp mustard. Mix well and then add gradually 1/4 cup of malt vinegar and 1 cup of the corned beef water.

Cook until mixture thickens.