what is the name of soup made from dfagon fruit flowers in cantonese

The Cantonese name is 霸王花 (baap3 wong4 faa1 in Jyutping), commonly used for the dried dragon fruit flower soup. It’s often called 霸王花湯 or 霸王花豬骨湯 when made with pork bones.

Name in Cantonese

• 霸王花 = the flower itself.

• 霸王花湯 = dragon fruit flower soup.

• 霸王花豬骨湯 = dragon fruit flower pork bone soup.

Small note

The flower is also linked to night-blooming cereus / pitaya flower in Cantonese soup usage, which is why different sources may describe it slightly differently.

TL;DR: The soup is usually called 霸王花湯 in Cantonese.