In a large bowl, stir together the milk and yeast. Stir in the sugar, eggs and vanilla and mix well. Add a cup of the flour and the salt, then gradually add another 2 1/4 cups of the flour, stirring and then kneading for a few (or several) minutes, until it’s smooth and elastic, and still a little tacky. Transfer to a baking sheet and cover with plastic wrap; chill in the refrigerator for 30 minutes.