Semolina flour is made from durum wheat. Durum means "hard" in Latin (similarly, in Spanish "duro" means "hard"). Durum is the hardest species of wheat, which means that it has high protein and gluten, so when the flour is mixed with water and yeast, strong gluten bonds form. This makes a rich, high-protein, puffy bread, or a tough dough, which is why semolina is commonly used to make pasta.
Ingredients2 3/4 tsp active dry yeast
1 5/8 cups warm water
2 Tbsp sugar
2 cups semolina (I used Bob's Red Mill
2 cups bread flour
2 Tbsp olive oil
1 3/4 tsp salt