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*For those who have the smallest semblance of interest in how to properly pronounce the name of this dish in Thai:
The first syllable, Som (ส้ม) has the same vowel quality of the long ô in “dome” or “Rome,” but is of smaller quantity. Say Rome or dome, but reduce the vowel quantity to half its length. Then replace the R and D with S, keeping the shortened vowel in place. That’s how you say it. As for the tone, the closest thing to the proper tone would be to turn it into a verb in the imperative mood and say it as if you’re making a command, “Som!” That should do it.
The second syllable, Tam (ตำ) has the same vowel quality and quantity as the word, “come.” Say “come” in the flattest tone possible. Then replace the “c” in “come” with “t.” That’s exactly the vocalization you’re looking for. For extra authenticity, make your “t” unaspirated/unvoiced. Place the tip of your tongue right behind your front teeth (or, in some cases, denture) and make the “t” sound without shooting out a breath of air between your upper and lower teeth as you would when pronouncing the English “t” (especially in the initial position).