Vinegar Pie - cooking recipe

Ingredients

3 Tbsp. vinegar
1 c. sugar
1 Tbsp. butter
4 Tbsp. flour
1 c. water
2 egg yolks

Preparation

Mix flour with half of sugar.
Add boiling water and cook 15 minutes.
Add rest of sugar and beaten egg yolks; cook a few minutes longer.
Add butter, vinegar and 1 teaspoon lemon extract, if desired.