汤圆 tāng yúan <=> 团圆 túan yúan

Idiom⌗

Tangyuan 汤圆 tāngyúan "soup balls" are a traditional Chinese dessert made of glutinous rice shaped into balls that are served in a hot broth or syrup.

This rhymes with 团圆 túanyúan "to reunite; to have a reunion". Because it can mean reunion in the sense of a family reunion, 汤圆 are often eaten during holidays.

Etymology⌗

The term 汤圆 tāngyúan comprises two characters:

1. 汤/湯 tāng "soup"¹. decomposes as 湯 ==> ⿰(氵, 昜)

   role	character
   semantic	氵 shuǐ "water"; an abbreviated 水 shuǐ. This is common enough to have a nickname: 三点水 sandianshui "three droplets of water".
   phonetic	昜 yáng an unusual form derived from either (1.) 易 yì "change;exchange" or (2.) 陽 yáng (more commonly 阳, a.k.a. the yang of yin/yang)

2. 圆/圓 yúan "circle; round". decomposes as 圓 ==> ⿴(囗, 員)

   role	character
   semantic	囗 wéi "enclose; surround". (Not to be confused with 口 kǒu "mouth".)