Cut garlic in half lengthwise, remove the core, and mince.

Boil water in a pot, add salt (not listed in ingredients) and spaghetti. Cook 1 minute less than the package instructions. Reserve 2 tbsp of pasta water and drain the spaghetti.

Heat olive oil in a frying pan over low heat. Add garlic and chili, sauté until fragrant. Add dried shirasu and stir over medium heat until coated with oil.

Add spaghetti, reserved pasta water, salt, and pepper to the pan. Quickly stir to combine.