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Best answer
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Look for yellow "jay" / vegan flags (especially Chinese-Thai areas) — Chinatown, some Sukhumvit sois, temple fairs. May Kaidee and Broccoli Revolution sit-down if street guesswork tires you. Regular pad thai often has fish sauce — say "jay" clearly. Vegetarian festival September Chinatown insane good. 7-Eleven soy options backup. Easier than Phuket, harder than Chiang Mai.
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Yellow "jay" flags on stalls — vegan Thai, cheap, random sois.
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Indian restaurants Sukhumvit Soi 22 — veg curries safe bet.