What solution tastes bitter?

There are many solutions that taste bitter. Some examples include:

* Coffee: The caffeine and other compounds in coffee contribute to its bitter taste.

* Dark chocolate: The higher the percentage of cocoa solids in chocolate, the more bitter it will taste.

* Olive oil: Some olive oils can have a bitter taste, especially those made from unripe olives.

* Bitter melon: This fruit is known for its intensely bitter flavor.

* Quinoa: The saponins in quinoa can give it a slightly bitter taste.

* Alcohol: Some alcohols, like whiskey and beer, can have a bitter taste due to the presence of tannins and other compounds.

* Aspirin: This common over-the-counter medication has a bitter taste.

* Bitter gourd: This tropical fruit is extremely bitter.

* Kale: While many people enjoy kale, it can have a slightly bitter taste.

* Brussel sprouts: These vegetables are known for their bitter taste.

* Grapefruit juice: The high concentration of citric acid in grapefruit juice can give it a bitter taste.

These are just a few examples, and the bitterness of a solution can vary depending on its concentration, preparation, and other factors.