Okay, so this pasta involves an extra step! The short story is that you make your dough but, before rolling, kneed in your chosen ingredients. Your ingredients will likely be a strongly coloured veg (e.g. carrot for orange and spinach for green) finely chopped and boiled, or spices such as paprika or turmeric. You then roll your pasta as normal, then through a tagliatelle cutter. After that you'll need to lay the different coloured noodles out on a table, slightly overlapped, and press together. You can then run them through the rollers again to help join.Read this super article for a more detailed guide: http://foodivakitchen.blogspot.com/2010/12/mother-in-laws-tongue-pasta-lingua-di.html