Homemade iced coffee may turn out bitter if ground beans are over-extracted. Letting brewed coffee sit too long at room temperature or in the fridge causes oxidation and bitterness. Additionally, making coffee too strong to counter dilution can also lead to bitter flavors. To ensure better iced coffee, use quality lighter-roast beans and grind them fresh. Avoid cooling brewed coffee overnight to prevent further brewing and over-extraction from settled grounds.
To avoid the most common iced coffee pitfalls, there are some simple steps you can incorporate into your morning java routine. First, select a quality bag of coffee beans that are not over-roasted; over-roasted beans can have exaggerated chemical compounds that can translate to bitterness.
Coffee oxidizes and develops a flat, sometimes overly bitter taste, when left to sit out too long at room temperature or in the fridge. It may seem like a convenient solution to store and cool your coffee carafe in the fridge for the next morning, but this can cause the leftover coffee grounds at the bottom to slowly continue to brew and over-extract - making the cold coffee bitter.
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