Your coffee may taste sour when you brew pour-over coffee because of under-extraction. This means that the water does not extract enough flavor compounds from the coffee grounds, leaving behind a lot of acids that make the coffee taste sour.

To fix this problem, you can try to use a finer grind for your coffee beans, which will increase the surface area and allow more extraction. You can also try to increase the brewing time or water temperature, which will also enhance extraction. These adjustments will help you balance out the acidity and sweetness of your coffee and make it taste better.
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