Why does coffee smell like cat pee when you use a French press?

It's not the French press itself that makes coffee smell like cat pee, but rather the way the coffee is brewed.

Here's why:

* Over-extraction: French presses are known for their full-bodied brew. However, if the coffee grounds are left in the press for too long, they can over-extract, leading to a bitter, harsh taste and a smell reminiscent of cat urine. This happens because certain compounds, like pyrazines, are extracted more readily when brewed for longer periods.

* Poor quality beans: Using low-quality, stale beans can also contribute to an unpleasant aroma. Stale beans often develop off-flavors, including those that resemble cat urine.

* Dirty equipment: If your French press is not cleaned properly, it can harbor bacteria and mold, which can also contribute to a musty or unpleasant odor.

Here are some tips to avoid the "cat pee" smell:

* Use freshly roasted beans: Fresh beans are essential for a clean, flavorful cup of coffee.

* Don't over-brew: Follow the recommended brewing time for your specific coffee beans. Typically, 3-4 minutes is ideal for a French press.

* Clean your French press thoroughly: Wash it with hot soapy water after every use and rinse it well to remove any lingering coffee grounds.

If you're still experiencing the "cat pee" smell even after trying these tips, it might be a sign that your coffee beans are too old or have been stored improperly.