Mayonnaise, Yogurt (No Oil) - cooking recipe

Ingredients

1 cup plain yogurt
2 tablespoons butter
4 tablespoons flour
1 cup milk
1 egg yolk
2 tablespoons lemon juice
1/2 teaspoon dry mustard
1/2 teaspoon salt

Preparation

Melt the butter in a skillet and stir in the flour.
Add the milk all at once and stir over medium heat until thick.
Remove from heat and beat in the egg yolk., lemon juice, mustard and salt.
Stir in the yogurt and cool.