1.
Warm the broth, do not boil. Add cornstarch and dissolve completely.
2.
Separate the eggs. Whip the egg whites until stiff. Add the yolks and lemon juice, mix well.
3.
Slowly add the mixture to the broth, stirring, and bring to a simmer.
4.
Carefully mix the lemon-egg sauce with the dish (stuffed vine leaves, etc.), serve immediately.