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Bring a large pot of water to a boil, and salt generously. Cook the spaghetti until 1–2 minutes short of al dente.
Reserve at least 250 mL of pasta water before draining.
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In a large rondeau or wide pan, add the olive oil and garlic.
Place over medium-low heat and slowly cook the garlic until light golden, but not dark brown. Add the chilli flakes and cook for about 30 seconds.
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Add about 150 mL of reserved pasta water to the garlic oil. Bring to a gentle simmer. Whisk or shake the pan vigorously to emulsify the oil and water into a cohesive sauce.
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Add the drained pasta to the pan and toss aggressively over medium-high heat for 1–2 minutes. Add more pasta water as required until the sauce becomes glossy and coats every strand.
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Add the parsley, then season to taste with salt and chilli flakes. Add a little lemon zest or juice, and finish with a drizzle of extra virgin olive oil.