In a large bowl mix the yeast and the warm milk until the yeast dissolves and allow to sit for about 10 minutes and looking bubbly.
Add the rest of the ingredients, except semolina, stirring well to mix. Then turn out a floured surface and knead the dough until smooth and elastic, about 8 to 10 minutes.
Clean the large mixing bowl, dry well and coat with a thin coat of olive oil. Place the prepared dough in a greased bowl, turning once to coat the top with oil.
Cover the bowl and allow the dough to rise in a warm, draft-free place until doubled, about 45 minutes to an hour.
Preheat oven to 425º F or 225º C.
Punch dough down and divide into two pieces for large pizzas. Divide more if you want smaller ones. Roll the dough out to desired thickness.
Place on lightly greased pizza pans or use a pizza stone.
Add the ingredients of your choice and pop into the hot oven until the crust and cheese are golden brown, about 12 to 15 minutes.