Dry-toast the lentils in a pan for 2-3 minutes before adding liquid to deepen their nutty flavor and improve texture, preventing them from becoming mushy.

Slowly cook diced onion and minced garlic in quality olive oil for 5-7 minutes until golden and caramelized, creating a rich flavor foundation that elevates the entire dish.

Cook spaghetti 1-2 minutes under the box time and finish it directly in the sauce, allowing it to absorb the tomato flavors while maintaining a tender bite.

Reserve starchy pasta water and whisk it into the sauce just before serving to create a silky, cohesive texture that binds all ingredients together beautifully.

Always grate whole Parmigiano-Reggiano cheese fresh at the table rather than pre-grating, preserving its complex nutty notes and ensuring optimal melting into the warm pasta.