Type Noodle | Place of origin Thailand | |
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Main ingredients Shahe fen, dark soy sauce, light soy sauce, garlic, Chinese broccoli, eggs, meat (commonly pork, chicken or beef) Similar Rat na, Pad Thai, Drunken noodles, Thai fried rice, Kuy teav |
Phat si-io (also transliterated as pad see ew, pad siew, or pad siu, Thai: ผัดซีอิ๊ว, [pʰàt sīːʔíw]) is a Chinese-influenced stir fried noodle dish that is commonly eaten in Thailand. It is also quite popular in Thai restaurants around the world.

The name of the dish translates to "fried (with) soy sauce" and it is very similar to the char kway teow of Singapore and Malaysia. Phat si-io is normally stir fried dry while another similar dish, rat na (in Thai) or lard na (in Laos), is served in a thickened sauce and generally has a lighter taste.

Phat si-io is made with dark soy sauce (si-io dam), light soy sauce (si-io khao), garlic, broad rice noodles called kuaitiao sen yai in Thai (commonly abbreviated to just sen yai meaning "big strip"), Chinese broccoli, egg, and some form of thinly sliced meat — commonly pork, chicken or beef — or shrimp or mixed seafood.

Phat si-io is sometimes also called kuaitiao phat si-io, which reflects the general practice of using flat rice noodle as the main ingredient. However, other types of noodles may also be used.
