Place the semola flour on a clean work surface or in a large bowl. Make a well in the center and add the eggs end extra yolk if used.
Using a fork, slowly start mixing the eggs into the flour.
Mix until a shaggy dough forms.
Transfer the dough to a working surface. Knead the dough for about 8–10 minutes until smooth, elastic, and firm. At first, it may seem dry, but keep kneading, semola flour absorbs moisture slowly.
If the dough feels too dry, wet your hands slightly while kneading.
Cover the dough and let it rest for at least 30 minutes at room temperature. This relaxes the gluten and makes rolling much easier.
Cut the dough into smaller pieces. Keep the remaining pieces covered while working.
Flatten one piece slightly and pass it through the pasta machine on the widest setting.
Place the pasta sheets on the working surface and continue with the remaining pieces of dough.
Gradually reduce the thickness setting.
If the pasta sheets become too long, cut them in half to make them easier to handle.
Continue to reduce the thickness setting until you reach your preferred thickness for tagliatelle.