Cooked Salad Dressing

Ingredients:
- 1/4 cup sugar
- 1 teaspoon all-purpose flour
- 1 teaspoon ground mustard
- 1/2 teaspoon salt
- 1 large egg, lightly beaten
- 1/3 cup white vinegar
- 2 tablespoons water
- 1 teaspoon butter
- 1/2 cup mayonnaise
- Torn mixed salad greens

Directions:
- In a small saucepan, combine the sugar, flour, mustard and salt. Stir in egg until smooth. Gradually add vinegar and water. Cook and stir over medium heat for 3 minutes or until mixture reaches at least 160° and coats the back of a metal spoon.
- Remove from the heat; stir in butter. Let stand for 5 minutes. Stir in mayonnaise until smooth. Cover and refrigerate until chilled. Serve with salad greens.