Mix the milk with 1 cup of sugar and the vanilla sugar and heat until the sugar dissolves, but do not bring to a boil. Cool the mixture and add the well beat eggs. Mix the remaining 1/2 cup of sugar with the lemon juice and caramelize in a pan. Do not burn the sugar. Spread the caramel into small cups (6-12 based on the number of servings you are making). Once it cools, pour the milk mixture on top of the caramel. Arrange the cups in a deep tray and fill the tray with warm water. Bake at 160 degrees (Celsius) for 3 hours. Let cool and serve cold.