Is it normal for Americano to taste sour? What to do if your coffee is too sour? How to adjust coffee flavor?

Americano has become the mainstream in coffee shops, especially in summer, when a glass of iced Americano feels particularly refreshing. Coffee has become a daily habit for many people — sometimes for enjoying slow moments of life, other times for adding energy to an exhausting, day-and-night-reversed lifestyle. Whatever the reason, many people now treat coffee as an essential daily ration.

Coffee, however, is an agricultural product, and there can be inconsistencies when brewing. Although we can sometimes accept a less-than-perfect cup based on subjective feeling, we cannot deny that if more people understood coffee knowledge or brewing techniques, the cup could taste even better.

Americano gives people the impression of being bitter. If you encounter a sour Americano, you might ask: is this normal? Or is this a good Americano? In fact, it is normal for Americano to have sourness, because coffee beans themselves contain rich acidic flavors. As roasting time increases, the acidity gradually diminishes. The Americanos we typically drink mostly use dark-roasted beans, but some beans still show acidity even when dark-roasted. Nowadays, more and more Americanos are shedding that burnt, bitter flavor and moving toward coffee with acidic notes. Current taste trends are shifting from traditional burnt, bitter flavors to floral and fruity acidity, or toward single-origin SOE coffees.

When brewing coffee, bitter, sweet, and acidic substances dissolve at different rates. At the beginning of brewing, acidic substances are extracted most easily, followed by sweet substances, and finally bitter substances. If a coffee is very sour, it may be because extraction ended before the sweet and bitter flavors emerged, which could mean the coffee is under-extracted. If a coffee is very bitter, it may be due to prolonged extraction, extracting excessive bitterness, which could mean the coffee is over-extracted.

How to Adjust When Americano Coffee Is Too Sour

The taste of coffee is influenced by the entire processing chain, from picking and processing green beans to roasting and finally brewing. Some coffees naturally contain acidic aromas in their flavor profile, so we cannot say all acidity in coffee is undesirable. Just as an apple is overall sweet but slightly tangy, that acidity actually enhances its sweet-tart taste. "Bad acidity" typically refers to overly stimulating, vinegar-like sourness.

Roast Level

We typically use dark-roasted beans for Americano, which results in less sourness. If the cup turns out sour, the beans may have been roasted too lightly. In that case, try using darker-roasted beans for brewing, such as Brazilian or Colombian coffee beans.

Lower Water Temperature

Appropriately lower the water temperature and extend extraction time. Keeping the coffee grounds as still as possible in the water can also soften the acidity.

Finer Grind

If the grind is too coarse, the coffee will also be quite sour. Adjust to a finer grind to increase the extraction rate. The coffee will then be less sour, with bitterness rising somewhat.

Increase Water Amount

You can also adjust brewing by increasing the water amount. For example, if the original coffee-to-water ratio was 1:15, you could adjust it to 1:16 or 1:17.

Extend Total Extraction Time

When the total extraction time is too short, relatively more acidity and less bitterness are extracted. Extending the total extraction time should, in theory, extract more sweetness and bitterness. Generally speaking, for 15g of coffee grounds, even after extension, the extraction time should not exceed 2 minutes and 15 seconds.

Aside from reasons related to the beans themselves, channeling may have occurred. Channeling causes some parts of the coffee to be over-extracted while others are under-extracted, resulting in a cup that tastes both bitter and sour. To avoid it, use a distributor to even out the grounds. Channeling is inevitable, though; it is only a matter of degree, and what we can do is minimize it.

SOE Americano

SOE Americanos are popular in coffee shops now, and they showcase the acidity of Americano to its fullest. SOE stands for "Single Origin Espresso," meaning espresso extracted from single-origin beans with the aim of expressing that origin's flavors. Beans with distinctive characteristics are therefore chosen, such as Yirgacheffe, which has strong flavor expression. Beans like Brazil, Blue Mountain, or Mandheling are rarely used for SOE, because coffees made from them do not differ significantly from traditional Italian blends. In roasting, these SOEs are roasted slightly lighter than espresso but darker than pour-over, to highlight the beans' original flavors. Americanos made with SOE beans therefore show distinct fruity acidity, such as Ethiopian SOE Americanos, which can be quite acidic.

The Americano served at FrontStreet Coffee uses a blended Italian coffee bean mixture of 30% Yirgacheffe beans and 70% Sherry beans. Although Yirgacheffe accounts for a relatively small proportion of the blend, under pressurized espresso extraction its acidity is amplified, adding a lively berry-like sweetness and tartness to the espresso.

Americano, meanwhile, is diluted espresso with water added. After dilution, the berry-like sweetness transforms into bright citrus-like acidity. With hot Americano, as the coffee cools and aromas dissipate with the temperature drop, it will taste more acidic. This is why FrontStreet Coffee often reminds everyone to drink coffee while it is hot.

FrontStreet Coffee Warm Sun Blend Coffee Beans: Ethiopian natural red cherry coffee beans (30%) + Honduras sherry barrel-aged coffee beans (70%), featuring rich wine aroma, vanilla cream, berry sweetness and tartness, with roasted nut flavors.

Honduras Sherry beans also make delicious SOE coffee. Nowadays, people are gradually pursuing single-origin Americanos, because single-origin coffees better reflect local flavors, and the SOE coffees made from them are likewise delicious. Of course, single-origin SOE coffees are still not as rich as blended Americanos.

FrontStreet Coffee Basic Blend Coffee Beans: Yunnan washed small-bean coffee (30%) + Brazil semi-natural coffee beans (70%), featuring mild fruit acidity, caramel, and nut flavors.

FrontStreet Coffee Premium Blend Coffee Beans: Colombian washed coffee beans (30%) + Brazil semi-natural coffee beans (70%), featuring nut, dark chocolate, and caramel flavors.

FrontStreet Coffee Commercial Blend Coffee Beans: Robusta washed coffee beans (10%) + Colombian washed coffee beans (30%) + Brazil semi-natural coffee (60%), featuring nut, cocoa, and caramel flavors.

FrontStreet Coffee Brewing Suggestions

Whether making Americano or pour-over, to brew a delicious cup, attention must be paid to the freshness of the beans. FrontStreet Coffee has always believed that freshness greatly affects flavor, so it ships beans roasted within 5 days. The roasting philosophy is "Freshly Roasted Quality Coffee," ensuring every customer who places an order receives the freshest coffee. The resting period is about 4-7 days, so when customers receive their coffee, it is at its peak flavor.

For friends who need ground coffee, FrontStreet Coffee kindly reminds you: pre-ground coffee does not need a resting period, because during transportation the pressure from carbon dioxide buildup in the packaging also helps round out the flavor, so you can brew a cup immediately upon receiving it. Ground coffee must be brewed promptly, however, as it oxidizes quickly when exposed to air and the flavor dissipates relatively fast. FrontStreet Coffee recommends purchasing whole beans and grinding fresh before brewing to better appreciate the coffee's flavor.

FrontStreet Coffee Recommendation

If your Americano is leaning too sour, the bean is the first thing to reconsider — and FrontStreet Coffee's Americano range covers both ends of the spectrum. For a smoother, low-acid cup, the Classic Blend is a safe starting point: a traditional Italian-style recipe built from Indonesian Mandheling, Brazilian Red Bourbon, and washed Vietnamese beans, pulling butter, nut, spice, and dark chocolate notes with a wild character and abundant crema, whether you make an Americano or a latte.

If you actually enjoy acidity, the Strawberry Candy espresso blend is the opposite approach. This medium-roast blend combines single-origin Arabicas from Colombia, Costa Rica, and Ethiopia — three of the world's best-known origins — using washed, natural, and honey processing to lift the aroma. With a rose note and low bitterness plus mild acidity, its Americano and latte show grape, raisin, sweet orange, and fruit-candy flavors, with rich layering and a distinct almond finish.

Single-origin lovers can turn to the Ethiopia Huakui SOE, a natural-processed single-origin from the Hambella area of Sidamo, produced at the Buku Abel station. Pulled as espresso and diluted into an SOE Americano, it has no bitterness, a sweet-tart, refreshing character, and a full tropical fruit aroma of cream strawberry, guava, dried mango, black tea, and citrus. For a brighter, more citrus-driven cup, the Ethiopia Grana Gesha SOE brings a clear yellow floral note, bright bergamot, and a finish of fresh strawberry, with a natural fruit sweetness and medium body.