What Pre-Opening Checks Do Coffee Shops Do Besides Calibrating Espresso? Do Latte and Cold Brew Also Need Taste Testing?

Coffee shops run a "morning test" every day before opening. As the name suggests, the main task is to taste the coffee that will be sold that day. If the flavor has drifted from yesterday's - if undesirable notes have appeared, for example - corrections are made.

Only once the tasting is finished do official hours begin. Many people wonder, though: with the same machine, the same water, the same parameters, and the same beans, how could the coffee taste different? Is a morning test really necessary?

Why Do Coffee Shops Need a Morning Test?

For pour-over coffee, where the variables are controllable, a daily morning test is indeed unnecessary to protect the taste. As long as every brewing parameter stays consistent, the final flavor is quite stable. Espresso is a different story. Even when all the parameters match yesterday's, for espresso extraction parameters alone cannot guarantee flavor stability. There are two main reasons, and the first is the effect of degassing on extraction.

As everyone knows, after roasting, abundant carbon dioxide sends beans into a degassing period lasting up to two months. Throughout that time they keep releasing gas, and after a night of release this easily introduces variables into extraction. Coffee that originally needed 20g of grounds and 30 seconds to yield 40ml of liquid, for instance, might pull in 25 seconds the next day. So yesterday's extraction parameters cannot guarantee an equally delicious cup today.

The first variable has a fairly small effect, though; the second is the main one - air humidity. Espresso extraction is easily influenced by weather. Daily humidity swings, especially in cool or rainy weather, show the biggest variation. The air fills with water molecules, becomes very humid, and atmospheric pressure drops. Grounds then clump easily, and during extraction the machine's pressure is somewhat restricted, so extraction becomes full of instability. Naturally, the flavor cannot be guaranteed to match yesterday's. And besides espresso, which needs its flavor corrected, other coffees need testing too.

What Else Needs Testing Besides Espresso?

Whether a shot tastes good does not determine how it performs in other espresso-based drinks, because each drink calls for different espresso characteristics. Espresso for an Americano tends to be preferred for its light mouthfeel and distinct flavor layers, while espresso for a latte needs a full-bodied flavor and rich texture - two quite different styles. So the drink with the highest customer purchase rate is often used to set the flavor direction of the espresso. As the universally loved latte, it plays exactly that role. That makes "latte" the second espresso-based drink that needs testing during the morning test.

Beyond espresso, one more single-origin coffee needs testing: cold brew. When first extracted, cold brew needs to ferment in the refrigerator for up to a whole night. The next day, the task is to confirm whether its flavor and concentration are normal after fermentation, and how much ice is needed to dilute it properly.

Cold brew can also be kept refrigerated for about 5 days, but refrigeration is not freezing, and spoilage is still possible. During that window, we need to test it every morning to confirm its flavor and quality stay consistent.

In short, the morning test in a coffee shop is very necessary. At home, by all means do whatever makes you happy. But for a café, the morning test is not only about the customers' taste preferences - it is also a guarantee of food safety.

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FrontStreet Coffee Recommendation

Cold brew features heavily in any morning test, and the beans you choose shape it. FrontStreet Coffee's Strawberry Candy Geisha Blend is made for cold brew: it combines the classic floral, fresh-fruit Geisha profile of Panama with a Costa Rican honey-processed coffee, one bringing delicate rose and orange and the other the grape, raisin, and strawberry-candy sweetness. Cold-brewed, it is sweet and bright, and with a little fermentation it even takes on a wine-like character.

If you prefer a floral iced coffee, try FrontStreet Coffee's natural Ethiopia Huakui. Grown in the birthplace of coffee and dried with the fruit still on the bean, it takes up plenty of sweet aromatics, and as cold brew it shows magnolia, cream strawberry, mango, guava, and black tea notes. For a full-bodied, juicy result, FrontStreet Coffee's Kenya Cherry Tomato is a top pick: its tomato, plum, and umami acidity shines at low temperature, with low bitterness and plenty of sweetness, especially over ice.

Since cold brew uses more grounds per batch than pour-over, it can also pay to blend. Many people love the passion fruit, grape, apricot, and dried-fruit sweetness of FrontStreet Coffee's Colombia Sidra, but at a high cost - blending it 1:2 with FrontStreet Coffee's Costa Rica Tarrazu gives you the Sidra's floral-fruit character plus Tarrazu's clean citrus acidity, at a friendlier price.