Mix the following in the top pan of a double boiler:
- 1 cup sugar
- 2 tablespoons dry mustard
- 1 pre-beaten egg yolk (no white)
- 1 cup light cream (you can use milk if you don’t have cream)
- 1 tablespoon flour
- 1/2 cup regular vinegar (cider or colored vinegar)
Heat in double boiler. Stir constantly. When the mixture starts to thicken, COVER and let cool. Serve warm or cold.