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黑芝麻 is “black sesame (黑 is black, and 芝麻 is sesame). 湯 is soup, and 圓 is ball (sometimes 丸 is used with the same pronunciation and meaning), so 黑芝麻湯圓 is black sesame soup ball.
Rice balls with a black sesame seed filling.
rice balls
peanut rice balls
red bean rice balls
green tea fried sesame ball
rice balls in syrup