Gemelli with Sausage-Tomato Sauce - Lidia

Ingredients

• 3 tablespoons extra virgin olive oil
• 1 medium yellow onion, sliced (about 1 ½ cups)
• salt
• 1 pound (about 5 links) sweet Italian sausages (preferably without fennel seeds), casings removed
• One 35-ounce can Italian plum tomatoes (preferably San Marzano) with their liquid, crushed
• 4 pickled cherry peppers, cored, seeded and diced
• ½ teaspoon dried oregano, preferably the Sicilian or Greek type dried on the branch, crumbled
• 1 pound gemelli pasta
• ½ cup freshly grated Pecorino Romano cheese