Pasta sticking together after cooking is a common frustration, turning perfect noodles into unmanageable clumps that are hard to serve.
Fortunately, as a home cook with years of perfecting pasta dishes, I've found a reliable trick that works for spaghetti, penne, or any pasta shape: add 1 teaspoon of olive oil to the boiling water. Here's how it works:

1. Start with a large saucepan. A bigger pot means more space, reducing the chance of sticking.
2. Fill it about 3/4 full with cold water.
3. Bring the water to a boil.
4. Once boiling, stir in 1 teaspoon of olive oil.
5. Add your pasta to the boiling water.
6. When cooked, drain in a colander.
Your pasta comes out perfectly separated, no sticking! Serve spaghetti or fresh pasta to guests worry-free.
Pro tip: Pair this with our guide on measuring the perfect pasta portion.
This method is effective, but not for the reason you might think. Olive oil floats on the water's surface:

Pasta cooks submerged below the oil layer. The real magic happens during draining:

Boiling creates movement from rising bubbles, keeping pasta from clumping initially. As you drain, the pasta passes through the oil, getting a light coating that prevents sticking—even as it cools.
Ideal for cold pasta salads!

Skip the oil if serving with tomato sauce—the coating creates a barrier, preventing sauce from adhering properly.
But it's perfect for oil-based dishes like aglio e olio!