Step 1. 

Cook fettucine according to packaging instructions until al dente. Drain and set aside.

Step 2.

Add the olive oil and onions to a saucepot, and cook over medium heat for 5-7 minutes, or until the onions are soft and translucent. Add the garlic and cook for another 2 minutes.

Step 3. 

Add crushed tomatoes, sugar, and salt. Stir to combine.

Step 4.

Cover pot, allow sauce to come to a simmer, then reduce heat to low, and let simmer for 35 to 40 minutes.

Step 5.

Fold in chopped basil and simmer for 5 minutes.

Step 6.

Add the cooked fettucine and black pepper into marinara sauce and stir to combine.

Step 7.

Remove spaghetti from heat and garnish with Parmesan cheese.