After trying several of the more expensive Thai places in Bahrain ("Royal Thai" - Gulf hotel, "Thailand Restaurant" - a block from Gulf Hotel, etc), I FINALLY stumbled upon a REAL authentic Thai restaurant : "Mamy Soup Restaurant". The Thai/Isaan food there is top-notch, AUTHENTIC Thai food. Despite the name, they have much more than soup. It's located on Road 1805 (a block off, and parallel to) Exhibition Road.
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