In the bowl of a stand mixer fitted with the paddle attachment or a large bowl, add the flour and semolina.
Make a well in the center. Add the eggs and mix until well-combined.
Slowly add just enough water to create a soft dough. If too wet, add a little more flour. If too dry, add a little more water.
On a lightly floured surface, knead the dough until smooth and elastic. Wrap in plastic and allow to rest at room temperature for 30 minutes or up to 1 hour.
Divide the dough into four equal pieces. Place one on a floured work surface and cover the remainder. Dust a large, rimmed baking sheet with fine semolina.
Roll the dough into a thin sheet using a pasta machine or rolling pin, starting with the widest setting and continuing to press and dusting with flour as needed to the second to last setting, about 1/16th-1/8th inch (1.5-3 millimeters) thick.
Cut the sheet of pasta into 1 1/2 inch (4 centimeter) wide strips. Cut the pasta again on the perpendicular 1 1/2 inches (4 centimeters) apart to create little squares of dough.
Remove any irregular pieces around the edges and set aside/cover (you can either cook these as is or reroll/cut).
Cover most of the squares with a cloth or plastic liner to prevent them from drying out as you work.
Place one square in your hand just under your index finger. Bring together two opposite corners up around your index finger and press the corners together to make a triangle with a hollow center.
Remove the triangle from around your finger and pull the two remaining corners away from the sealed edge in the opposite direction and press together to make a shape similar to tortellini.
Place the formed Sorpresine on the semolina-dusted baking sheet and repeat with remaining squares and remaining dough, keeping the shaped pasta from touching one another.
Allow to dry uncovered on the baking sheet for at least 15 minutes and up an hour.
To cook, bring a large pot of salted water to a boil. Add the pasta in batches, careful not to overcrowd, and boil until they rise to the surface and are just tender, about 2-3 minutes if fresh. If serving in broth, you can add them straight to the broth during the last couple of minutes of cooking.
Uncooked pasta can be frozen in a single layer, then transferred to a freezer-safe bag. They can be boiled straight from the freezer, though a minute or two may need to be added to the cooking time.