| Directions | Beat egg well. Add dry ingredients, vinegar and water. Cook on top of double boiler until thick. Remove from heat and beat in 3 tablespoons butter. |
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Ingredients | - |  | 1 egg |
- |  | 1/2 cup sugar |
- |  | 2 tablespoons flour |
- |  | 1 teaspoon mustard |
- |  | 1 teaspoon Salt |
- |  | 4 tablespoons vinegar |
- |  | 1 cup cold water |
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