Ingredients

• 1/2 cup distilled white vinegar
• 3 eggs
• 2 teaspoons vegetable oil
• 2/3 cup white sugar
• 1 tablespoon mustard powder
• 1 tablespoon butter, melted
• 3 tablespoons all-purpose flour
• 1 teaspoon salt
• 1/2 teaspoon ground black pepper
• 1 cup milk
• 3 cups water

Instructions

1. In a medium bowl, mix together eggs, oil, white sugar, mustard, melted butter, flour, salt, and pepper. Mix in milk and water. Set aside.
2. Heat vinegar in the top of a double boiler over boiling water. Gradually fold egg mixture into the hot vinegar. Cook until the sauce thickens, stirring constantly.