dragon fruit
Bitter Lemon
dragon fruit
fruit
a star fruit
bitter melon
In unripe fruit, the plant has made the fruit acids but not yet made the sugars to make the fruit sweet.
lemon
The sweet but bitter fruit was sitting on the table, waiting to be eaten.
Aristotle
bitter lemon
Aristotle did
Bitter gourd also known as bitter melon is green and sweet when raw.