What is a sour fruit that made sweet?

* A lemon made into lemonade: Lemons are sour, but when mixed with sugar and water, they become a sweet drink.

* A lime made into a key lime pie: Limes are sour, but the combination of the filling and crust makes a sweet dessert.

* A grapefruit made into marmalade: Grapefruits are sour, but when cooked with sugar and other ingredients, they become a sweet spread.

Let me know if you'd like to try another riddle! 😊