Pan-Thai — vegetable stir-fry as a technique is Chinese-influenced but has been integrated across Thai cooking
Phat phak ruam is not a single dish but a technique — the art of stir-frying mixed vegetables to achieve the correct texture for each element while maintaining a unified sauce. The Thai approach to vegetable stir-fry involves cooking more delicate vegetables (morning glory, Chinese spinach, bean sprouts) for under 60 seconds total, and harder vegetables (broccoli stems, baby corn, carrot) for 2–3 minutes before the softer elements are added. Garlic and oyster sauce are the minimal flavouring base. The wok must be scorching — the vegetables should 'jump' rather than steam, and slight charring of the leaf edges is correct.
The wok's direct heat caramelises the surface of vegetables in a way no other cooking method achieves — the slight char on the leaf edges of morning glory or gai lan is the Maillard signature that makes vegetable stir-fries far more flavourful than boiled or steamed alternatives.
{"Sequence by density: hardest vegetables first, most delicate last","Maximum heat and small batches — crowded wok steams instead of fries","Garlic first in hot oil, then hardest vegetables, progressive addition by texture","Oyster sauce and a small amount of fish sauce; no need for complex seasoning","Serve immediately — resting in the wok after cooking is complete results in steamed, wilted vegetables"}
For morning glory (pak boong) specifically — the quintessential Thai quick-fry vegetable — the technique is to add garlic, optionally yellow bean sauce (tao jiew), and morning glory to a very hot wok and toss constantly for 45–60 seconds only. Morning glory should arrive at the table with some crunch remaining; fully soft pak boong is overcooked.
{"Adding all vegetables simultaneously — the result is an uneven mixture of overcooked and undercooked elements","Using low heat — produces steamed vegetables rather than wok-charred ones","Adding too much sauce — vegetable stir-fry should be lightly sauced, not swimming","Not drying vegetables before adding — surface water drops wok temperature immediately"}