Put the flour on a wooden board forming a well in which you will crack and pour four eggs. With a fork, whisk the eggs until whites and yolks mix.
Work the dough by hand until it becomes a homogeneous ball. Leave the dough wrapped in cellophane for at least 20 minutes (up to 1hour).
With the rolling pin, roll out the dough until you obtain a sfoglia, a thin sheet of even thickness, that will have a surface of approximately 70 x 50 cm and a thickness of a little less than a millimeter.
Let the pasta sheet dry a bit and as soon as the level of humidity allows it, fold the pasta multiple times until it becomes a roll of 7-8cm.
Cut the pasta roll in equal parts of 6,5-7 mm each, then unwrap each tagliatella collect 7 in your hand and wrap them around it forming a “pasta nests”.
Meanwhile put the water on to boil in a 10 liter pot. Add two spoons of salt to the boiling water and put the tagliatelle in, making sure to keep them separated from one another with fork.
After 1-2 minutes pour the tagliatelle into a colander to drain and pass them into the pan with the sauce of your choice and a ladle of pasta water.