Creamy Lemon Garlic Spaghetti in 12 Minutes Step-by-step instructions

Before you start

Before you start, bring a large pot of salted water to a boil. While it heats, dice the onion finely, mince the garlic, zest and juice the lemon, and grate the parmesan. Measure out the cream and have the parsley chopped.

Keep the pasta water nearby after draining—you'll need it to finish the sauce. Set everything within reach so the cooking goes smoothly. This is a fast recipe, so having the ingredients ready ensures you won't be scrambling while the pasta cooks.

Instructions

Cook the pasta

1. 1Cook the spaghetti
   Bring a large pot of salted water to a boil. Add the spaghetti and cook according to package instructions until al dente. Reserve about 1/2 cup of the pasta water before draining.
   Look for The spaghetti is tender but still has a slight bite in the center.
   Tip Salt the water generously—it's the only chance to season the pasta from within.
2. 2Drain the pasta
   Drain the spaghetti in a colander, but do not rinse it. Keep the reserved pasta water nearby.
   Look for The pasta is glossy and lightly coated with starch.
   Tip Rinsing removes the starch that helps the sauce cling to the noodles.

The spaghetti should be al dente—firm to the bite but not hard in the center. When you lift a strand, it should bend slightly and not stick to itself. The pot should still have starchy water, which you'll reserve. The pasta is ready to drain, but keep the water warm for later.

Build the sauce

3. 3Sauté the aromatics
   In a large skillet, heat the olive oil and butter over medium heat. Add the finely diced onion and cook until soft and translucent, about 3 minutes. Add the minced garlic and cook for 30 seconds until fragrant.
   Look for The onion is golden and soft, and the garlic smells nutty, not burnt.
   Tip Keep the heat medium so the garlic doesn't brown too quickly and turn bitter.
4. 4Make the cream sauce
   Pour the heavy cream into the skillet. Add the fresh lemon juice, lemon zest, salt, and grated parmesan. Stir and bring to a gentle simmer, letting the sauce thicken slightly.
   Look for The sauce is smooth, pale yellow, and coats the back of a spoon.
   Tip Simmer gently—boiling can make the cream separate and look curdled.

The onion is soft and translucent, and the garlic is fragrant but not browned. When you add the cream, it should bubble gently around the edges.

The sauce will look pale yellow from the lemon zest and will have thickened slightly after a minute of simmering. It should coat a spoon lightly.

Toss and serve

5. 5Combine pasta and sauce
   Add the drained spaghetti to the skillet with the sauce. Toss with tongs or a wooden spoon until every noodle is coated.
   Look for The spaghetti is completely coated in a silky, creamy layer.
   Tip If the sauce seems too thick, add a splash of pasta water to loosen it.
6. 6Finish with pasta water
   Add the reserved pasta water, a little at a time, while tossing. The starch in the water helps the sauce cling to the pasta and creates a glossy finish.
   Look for The sauce turns from thick to silky and lightly coats each strand.
   Tip Add just enough to reach the desired consistency; you may not need all of it.
7. 7Season and serve
   Season with freshly cracked black pepper and sprinkle with chopped parsley. Toss once more and serve immediately.
   Look for The pasta is glossy, with flecks of parsley and pepper on top.
   Tip Serve right away—this dish is best hot and creamy.

The spaghetti is thoroughly coated, with a glossy sheen from the pasta water. The sauce clings to the noodles, and you see flecks of parsley and black pepper. The pan looks creamy, not soupy, and the aroma is rich with lemon and garlic. Serve immediately.

Common mistakes

One common mistake is overcooking the garlic, which turns bitter and harsh—keep the heat medium and stir constantly. Another is boiling the cream sauce, which can cause it to separate and look curdled; simmer gently instead.

Adding all the pasta water at once can make the sauce too thin, so add it gradually. And don't rinse the pasta after draining—you'll wash away the starch that helps the sauce cling.

How to tell it’s done

The dish is done when the spaghetti is al dente—tender but with a slight bite—and the sauce is silky and clings to the noodles without being runny. The sauce should coat the back of a spoon and look glossy, not curdled.

Taste a strand: it should be creamy, with a bright lemon note and a savory garlic background. If the sauce seems too thick, add a splash of pasta water; if too thin, let it simmer a minute longer.