Swedish Mayonnaise - cooking recipe

Ingredients

2 tablespoons butter
2 tablespoons flour
1 cup water
2 egg yolks
2 teaspoons salt
1 teaspoon dry mustard
1 teaspoon lemon juice
1 tablespoon vinegar
2 tablespoons salad oil
1/2 cup heavy cream
1 pinch of sugar and pepper

Preparation

Melt butter. Add flour until you have a paste. Add water and cook until thickened.
Add egg yolks and dry ingredients and beat thoroughly.
Add lemon juice, vinegar, and oil, gradually, mixing as you go.
Whip cream and fold inches.