Finely chop the basil.
Lightly beat the egg, and add it to the semolina in a mixing bowl.
Add the grated Pecorino Romano and minced basil.
Drizzle in the milk and olive oil.
Start kneading the dough together and once combined, transfer it to a large, flat surface.
Knead by hand or in a stand mixer with the hook attachment 8 minutes until the pasta is smooth.
Rub a dab of olive oil on the ball of dough and then cover with plastic wrap so that it doesn’t dry out.
Allow the dough to rest for 30 minutes to allow the gluten to fully develop. The dough should spring back when touched.
Divide the dough into quarters, keeping the remaining pieces of dough covered with plastic wrap.
Sprinkle some semolina on and under the dough to prevent sticking
Roll out the dough to 5mm (less than ¼ inch).
Sprinkle the dough abundantly with semolina. Fold in both ends of the dough and slice the pasta into 1cm (.3 in) thick strips, 12-13 cm (~4.5 to 6 inches) long.
Boil the pasta for 4-5 minutes.
Click here to watch Chef Enrico Cosentino (the original creator) make scialatielli (in Italian).