01 -
Thinly slice the red onion and finely chop the garlic cloves.
02 -
Bring a large pot of water to a rolling boil, add 2 teaspoons of salt, and cook the spaghetti until al dente according to package directions. Reserve 240 ml of pasta water before draining.
03 -
Heat olive oil in a wide pan over medium heat. Add the sliced onions and sauté for 6–7 minutes, stirring regularly, until they become golden and caramelized.
04 -
Add the finely chopped garlic to the pan and cook for 1–2 minutes, stirring until fragrant. Pour in the chili oil and mix to combine.
05 -
Reduce heat to low. Add the heavy cream, Italian seasoning, and salt to taste. If the mixture is too thick, add a splash of reserved pasta water for desired consistency.
06 -
Toss the drained pasta into the pan and combine thoroughly with the cream sauce, ensuring each strand is well coated.
07 -
Serve immediately, garnished with freshly grated Parmesan cheese and chopped parsley if desired.