Common myths about coffee brewing that we need to bust

10 December 2023

Welcome to Coffee Haven, where the aroma of freshly roasted beans fills our Massachusetts air and the perfect cup is our highest priority. We often hear from our regulars about their favorite brewing methods, yet many popular beliefs about how to make the best coffee are actually nothing more than misconceptions. In this article, we aim to separate the science from the superstition so you can brew a truly exceptional drink every time.

The Water Temperature Myth

One of the most persistent myths in the coffee world is that water must be boiling hot to extract the best flavors from the grounds. Many home brewers believe that pouring water directly from the tap or even using a kettle that has reached its maximum boil is essential for a rich, bold cup. However, this is simply not true. In fact, using water that is too hot can actually scorch the delicate oils and acids within the coffee bean, leading to a bitter, burnt taste that masks the subtle notes of chocolate, nuttiness, or fruitiness.

The sweet spot for brewing almost any method, from pour-over to French press, typically falls between 195°F and 205°F (90°C to 96°C). This temperature range allows for a balanced extraction, pulling out the desirable sugars and acids without burning the bean. If you do not have a dedicated thermometer or an insulated gooseneck kettle, you can estimate this temperature by checking that the water has just started to simmer but has not yet reached a rolling boil. Remember, coffee is a product of precision, and the water is just as important as the beans themselves.

The Role of Acidity in Brewing

Understanding the relationship between water temperature and acidity is crucial for mastering your brewing technique. When water is too hot, it over-extracts the acidic compounds in the coffee, resulting in a sharp, sour profile that some people mistake for "freshness" but is actually a flaw in the brewing process. Conversely, water that is not hot enough will under-extract, leaving the coffee tasting flat, dull, and lacking in body. By adjusting the temperature slightly, you can tailor the cup to your personal preference; a slightly cooler brew will highlight sweetness and reduce bitterness, while a warmer one can enhance body and strength.

The Grind Size Misconception

Another widespread myth concerns the relationship between grind size and brewing time. Many people assume that a coarser grind is always better for coffee machines and that a finer grind is necessary for all methods. This is a dangerous oversimplification because the ideal grind size is entirely dependent on the extraction method you are using. Using the wrong grind size can ruin your cup regardless of your bean quality or water temperature.

Here is a quick guide to matching your grind size to your brewing method:

French Press: Requires a coarse grind to prevent fine particles from passing through the mesh filter, which would make your coffee gritty.
Drip Machine: Typically works best with a medium grind, similar to sea salt texture, to allow water to flow through the bed of grounds evenly.
Pour-Over: Needs a medium-fine grind, often compared to table salt, to control the flow rate and ensure a clean, crisp cup.
Espresso: Demands a very fine grind, like powder, to create the high-pressure resistance needed to force hot water through the puck quickly.

The Bean Freshness Misunderstanding

There is also a common belief that coffee is best when it is roasted the day before it is brewed, or even the next day. While coffee does continue to change after roasting, the idea that it sits perfectly still for days is a myth. Once roasted, coffee begins to oxidize, meaning oxygen reacts with the organic compounds in the bean, causing a slow degradation of flavor and aroma. This process is often accelerated by heat, light, and moisture.

For the best results, coffee should ideally be consumed within 30 to 90 days of its roast date, assuming it has been stored in an airtight container away from light and heat. Buying coffee that is "freshly roasted" but has been sitting on a shelf for months will not taste as vibrant as coffee that was roasted recently and consumed shortly after. The key is freshness, not longevity; a bean that is three months old might taste okay, but a bean that was roasted yesterday and brewed today offers the most complex and engaging flavor profile.

The Myth of Perfect Brewing Consistency

Finally, many people believe that coffee brewing is a precise science where every variable must be measured to perfection to get the same result every time. While consistency is important, the idea that you need a scale, a thermometer, and a timer for every single cup is unnecessary for most casual drinkers. The human palate is incredibly variable, and what tastes perfect to one person might be too strong or too weak for another.

Most specialty coffee shops, including our own at Coffee Haven, rely on a combination of skill, intuition, and consistent habits rather than rigid formulas. The beans we use are consistently sourced and roasted, the water is filtered to a standard quality, and our baristas are trained to adjust their techniques based on the specific batch of beans. You can achieve excellent results at home by sticking to a routine, using good quality beans, and paying attention to how the coffee tastes to you personally. Embrace the art of brewing rather than treating it like a laboratory experiment.

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