If you've used too many egg whites, your carbonara may be more watery than creamy. Ensure you follow the yolks-to-whites ratio below for the best results.   Add a creamy soup to the side of this tagliatelle carbonara for a more filling meal. Here are some ideas: Easy Carrot and Coriander Soup, Creamy Broccoli and Cauliflower Soup, or Roasted Vegetable Soup.