01 - Heat olive oil in a large, deep skillet over medium heat. Add sliced garlic and red pepper flakes, sautéing until garlic turns golden, about 1 minute.
02 - Add uncooked spaghetti to the skillet, spreading out evenly. Toast pasta for 1–2 minutes, stirring occasionally until lightly golden in spots.
03 - Pour tomato passata over the spaghetti and sprinkle with salt. Tilt the pan to ensure all pasta is well coated.
04 - Pour in just enough hot water to barely cover the pasta. Add more during cooking as needed to prevent sticking.
05 - Cook over medium heat, stirring occasionally, until spaghetti is al dente and most of the liquid has absorbed or evaporated, about 15–18 minutes. The bottom should crisp and caramelize lightly.
06 - Taste and adjust seasoning if needed. Serve immediately, garnishing with chopped parsley if desired.