Put the measured out semolina flour onto a clean work surface. Then sprinkle it with the salt and form a well in the center.
Slowly pour the warm water into the well and begin incorporating it into the flour using your fingers or a fork. Only use as much of the water as necessary to create a dough that is soft like playdough.
Once you have a rough dough, knead it for about 10 minutes or until it is elastic. Then form the dough into a smooth ball
Wrap the ball of dough in plastic wrap and allow it to rest for at least 30 minutes at room temperature.
After the dough rests for at least 30 minutes, cut off ¼ of the dough. Then rewrap the remaining dough in the plastic wrap to keep it from drying out.
On a clean work surface, roll the piece of dough into a long rope that is about ½ inch in thickness. If it's easier you can also cut the rope in half. But do not add any flour to the work surface.
Cut the rope of dough into ½-inch portions in length. They should all be about the same size.
Use the side of your thumb to press firmly onto each cut piece of dough as you roll it towards you to create an indentation that forms a shell shape.
Once you have finished forming all the portions of dough into cavatelli, lightly sprinkle them with semolina. Then place the cavatelli in a single layer not touching each other on a baking sheet lined with parchment paper that has also been dusted with semolina.
Finish forming the pasta by cutting off portions of dough, rolling it into ropes, and shaping it into cavatelli.
Bring a large pot of salted water to a boil. Then cook the cavatelli for about 2 minutes or until they float to the top.