Suong Food — Vietnamese home cooking anchored on phở | suongfood.com
The bowl is decided in millimetres and seconds: 6–10 mm noodles blanched 10–20 seconds, and beef sliced 1–3 mm that sets under hot broth in 15–30 seconds.
Phở uses a flat rice noodle 6–10 mm wide. The thin round vermicelli called bún measures only 1.5–2 mm and belongs to other dishes; swapping it in produces a different bowl, not a thinner phở.
Fresh phở noodles need only 10–20 seconds in boiling water. The named failure is overboiling: past that window the noodles turn gummy and continue softening once the hot broth hits them.
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For phở tái, the beef is sliced raw at 1–3 mm thick and laid over the blanched noodles. Broth is then ladled over at 85–95 °C — the same temperature the broth held during its simmer, as detailed at /pho-broth-simmer-and-spices.
At 85–95 °C, a 1–3 mm slice sets within about 15–30 seconds. Two failures follow from the same numbers: broth that has cooled below 85 °C leaves the meat raw, and slices thicker than 3 mm stay raw in the centre even under correctly heated broth.
Season the finished bowl at the table with fish sauce chosen by grade — the °N scale and the nước chấm ratio are laid out at /fish-sauce-and-nuoc-cham.
Further reading