How do I prevent the egg yolk from scrambling?
Toss the hot pasta off heat with the sauce first, then add the egg yolk while stirring constantly. The residual heat will gently cook it into a silky coating without scrambling.
Can I use regular soy sauce instead of oyster sauce?
Soy sauce will work but lacks oyster sauce's subtle sweetness and body. Use slightly less (1.5 tbsp) as soy is saltier and more assertive.
What type of chili oil works best?
Any chili-infused oil works—store-bought or homemade. Adjust to taste; it's optional but adds heat and complexity.
Why do I need reserved pasta water?
Pasta water's starch emulsifies the oil and sauce into a silky coating that clings to noodles. It's essential for the dish's texture.
Is this recipe vegan or vegetarian friendly?
It contains egg yolk and Parmesan (vegetarian but not vegan). Oyster sauce is traditionally not vegetarian; use vegetarian oyster sauce or mushroom-based sauce to adapt.