The pasta should be tender but still slightly firm because it will continue cooking in the oven.

Drain the pasta but do not rinse it. Rinsing removes starch that helps the sauce cling to the pasta.

Set aside.

Step 2: Prepare the Tomato Sauce

Heat olive oil in a large skillet over medium heat.

Add the diced onion and cook for 5–6 minutes until softened continue reading …