Ingredients

• Kosher salt
• 6 tablespoons butter
• A few leaves fresh basil, torn
• 1 large clove garlic, grated or pasted, optional
• 1 small onion, halved
• One 28-to-32-ounce can crushed Italian tomatoes
• 1 pound spaghetti
• Freshly grated Parmigiano-Reggiano

Instructions

1. Heat a large pot of salted water to boil for the pasta.
2. Melt the butter in a sauce pot over medium heat. Add the basil, garlic, if using, onions and tomatoes and season with salt. Bring to a simmer and let reduce 20 minutes, stirring occasionally. After 12 to 13 minutes in, drop the pasta into the boiling water and cook to al dente.
3. Remove the onion halves from the sauce and add a ladle of starchy pasta cooking water. Drain the pasta and add to the sauce. Toss to combine. Serve the pasta topped with Parmigiano-Reggiano.