In a stand mixer bowl or a large mixing bowl (for hand kneading), combine the flour, semolina, salt, sugar, and oil.
Add half of the water and start kneading on low speed (or by hand).
Gradually add the yeast and remaining water until a soft ball forms.
Knead for 12 minutes total.
Turn the dough onto a lightly floured surface, knead briefly to smooth it, and shape into a ball. Place it back in the bowl.
Drizzle a little oil over the dough to prevent drying. Cover with plastic wrap and a kitchen towel.
Let the dough rise for 1 to 1.5 hours, until doubled in size.
Transfer to a work surface, gently punch down the dough, and knead lightly to release the air.