Thailand's food

Today we went to buy lunch on a Thailand's restaurant, is very different from chineses, the latter has the buffet format, but the former was more traditional with a lot of not common options, I ate Pad Thai Gung, which means (I just discover it) "fried Thai style with shrimps", it was delicious and also had a lot of shrimps.
Two of us bought it and found exactly two brown spicy beans but none us was able to identify them.

Location: Thai Su, Paraguay st. and Reconquista st., Buenos Aires