Bring a large pot of salted water to a boil. Add the spaghetti when the water is boiling.

Finely chop the garlic and add it to a deep skillet with olive oil and red pepper flakes. Sauté for a few minutes, then add the walnuts.

Remove the spaghetti from the pot about one minute before it’s fully cooked and transfer it to the skillet. Add a ladle of pasta cooking water. Before the water evaporates completely, drizzle with a little more olive oil. Plate the pasta and top with a spoonful of pesto. Enjoy!