Do I have to use San Marzano tomatoes?
Nope. They are great, but any good canned whole tomatoes work. If you only have crushed or diced, use them. Whole tomatoes often taste a little cleaner to me, but brand matters.
Why toss the pasta in the sauce instead of just pouring sauce on top?
Tossing in the pan is the difference between “pasta with sauce” and “sauced pasta.” The starch in the pasta water helps emulsify everything so it coats instead of pooling.
How do I keep spaghetti from sticking together?
Use plenty of boiling water, stir during the first minute, and do not overcook. If you drain it and it has to wait, toss with a small splash of olive oil. Better yet, time it so the pasta goes straight into the sauce.
Can I add meat or veggies?
Absolutely. Brown Italian sausage first, then build the sauce in that same pan. For veggies, sauté mushrooms or zucchini in olive oil, then proceed with the garlic and tomatoes.
My sauce tastes sharp. How do I fix it?
Add a pinch more salt, then try 1 to 2 teaspoons butter or a small pinch of sugar. Also make sure the sauce simmered long enough to mellow the raw tomato edge, usually 10 to 15 minutes.
Can I use pre-grated Parmesan?
You can. Freshly grated melts in smoother and gives you that glossy finish faster, but pre-grated will still get dinner on the table.