On a cutting board or other food safe surface, pile your semolina flour and salt.
Make a well in the center of your pile, put your yolks and sourdough starter in the center of the well.
From the middle, begin mixing everything together with a fork. Slowly incorporate the flour from the outside into the middle.
When the flour is almost fully incorporated, begin kneading by hand. You really need to feel the dough, if it is feeling dry, you will need to incorporate a bit of water, if it is soft, you will need to add more flour. You want the consistency to be similar to play doh, but a bit drier.
Knead by hand for about 5-10 minutes to work the gluten. Pretty much just go as long as your arms will allow.
Wrap the dough and allow it to rest for at least 30 minutes. You can leave it in the fridge for up to 24 hours.
After your dough has rested, separate it into 4-6 equal pieces to begin rolling.
With a rolling pin, roll the pasta into long sheets dusting with flour as necessary to keep from sticking to your work space. If you have a pasta roller this is much easier.
If you do not have a pasta roller, continue rolling out your sheets until they are long and thin, trying to keep them as even as possible, you can cut into wide noodles with a bench scraper or pizza cutter.
If you have a pasta roller, roll your sheets to a number 6 then cut into any desired shape you prefer.
To cook your pasta, bring a pot of salted water to a boil. Boil your noodles for 3-5 minutes until al dente. Fresh pasta cooks very quickly compared to dried pasta
You can store your fresh pasta for up to a week covered in the refrigerator, or you can dry the pasta by leaving it on a wired rack or hung on a pasta drying rack in a well ventilated area of the house with good air flow. This can take up to 2 days to get fully dry. You can store dried pasta for like, 6 months, but I guarantee you'll use it before then!