In a large pot, boil the milk with the sugar and the vanilla. In a bowl, stir together the semolina with the eggs and salt. Add a little warm milk to the semolina and then pour into the pot with the milk, stirring the cream until it thickens. Add the butter; stir and let the cream to cool and thicken. Place one layer of dough ito a buttered baking pan, spread the cream out evenly and cover with the second layer of dough.