Why does Luckin Coffee Full Extraction spark complaints?

Luckin Coffee released its Full Extraction series, three milk coffees built on a Cafe Crema full extraction espresso base: Full Extraction Oat Latte, Meteorite Latte, and Latte, promoted with 2022 WBC champion Anthony Douglas. The process pulls more liquid from the same dose to raise intensity. Early reviews on Chinese social platforms were largely negative, with drinkers comparing the taste to dishwater or burnt herbal soup.

The complaint points to a real trade-off. Extracting far more liquid than a standard espresso shot also draws out late-soluble compounds that read as harsh and bitter, and the extra water dilutes body. The launch also follows a broader market pattern: flavored milk coffees dominate menus, and a coffee-forward product like this WBC coffee line tests whether drinkers want stronger coffee flavor or lighter, sweeter drinks.

Luckin Coffee recently launched a new product line—the Full Extraction series, comprising three milk coffees: Full Extraction Oat Latte, Full Extraction Meteorite Latte, and Full Extraction Latte, recommended by Anthony Douglas, the 2022 WBC World Coffee Champion. The brand claims to use the Café Crema full extraction process to extract more coffee liquid and boost intensity, targeting those who prefer bold flavors. However, the first wave of reviews on social platforms has been uniformly negative, with consumers describing the taste as resembling dishwater or burnt Chinese herbal soup. What exactly is the concept of full extraction? How does it differ from espresso? Why aren't consumers buying it? This article analyzes from the perspectives of extraction principles and market trends.

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Office workers have tried more and more new coffee products, and one obvious impression is that with flavor syrups, novel dairy products, and various toppings layered on top, the pick-me-up drink in hand looks increasingly like milk tea, while the taste of coffee itself keeps receding into the background—even pure coffee flavor is quietly fading from view.

When flavored milk coffees and fruity specialty drinks are everywhere, coffee lovers' palates inevitably grow weary, and calls for brands to return to authentic coffee are mounting. Perhaps picking up on this market sentiment, or perhaps hoping to find a new entry point in the espresso segment, Luckin has decided to try something different this time.

According to Luckin's official announcement, the brand is about to launch a new product line—the Full Extraction series, covering three new milk coffees: Full Extraction Oat Latte, Full Extraction Meteorite Latte, and Full Extraction Latte, enthusiastically recommended by Anthony Douglas, the 2022 WBC World Coffee Champion.

According to the brand's promotional language, all products in this series use the "Café Crema full extraction process" to make the espresso base. The principle is to extract more coffee liquid, thereby "pulling up" the coffee intensity, making it especially suitable for consumers who prefer rich flavors. The advertising copy also includes a rather provocative expression: "heavier than the work fatigue on an office worker."

When a cup of coffee reaches the consumer, taste is always the decisive factor. So how does the Full Extraction series actually taste? After extracting more coffee liquid, does the coffee flavor really become stronger? On social platforms, the first batch of reviews from early tasters almost unanimously expressed dissatisfaction, and the answer seems to have surfaced.

"So bitter it hit my heart" "A sip of burnt dishwater" "I suggest anyone looking for something bitter come drink this" "One sip down, indeed bitterly intense" "It's just badly brewed Chinese herbal soup with water added, right" "After stirring, it's a bit like scorched sunflower seeds mixed with powder and taken with water..." "(It's like) adding some milk to a plain Americano—less refreshing than an Americano, less rich than a latte"

Regarding the key concept of this launch—"full extraction"—coffee professionals should find it familiar. It corresponds to the professional coffee term "Lungo," also translated in Chinese as "long extraction" or "over extraction." As for the name "full extraction," many people may have first encountered it on Starbucks' ordering page, so it can also be explained as "deep extraction."

The so-called Lungo is actually based on the original Espresso parameters, keeping the dose unchanged while extending the extraction time to increase the total amount of coffee liquid, ultimately obtaining an espresso with a larger volume and more fully extracted soluble flavor compounds (considering only total substance, without distinguishing flavor quality for now).

Generally speaking, the brew ratio for making a Lungo is about 1:5. Taking 20 grams of coffee grounds as an example, the extracted liquid weighs about 100 grams, and the time typically falls between 40 and 70 seconds. Judging from the preparation videos shot on-site by many consumers, the liquid weight of Luckin's full extraction espresso also roughly falls within this range, though the extraction time is shorter.

Applying extraction logic and concentration principles to understand: under the premise of the same dose, full extraction increases the water content in the coffee liquid, so compared with regular Espresso, the overall coffee concentration will naturally decrease rather than increase.

In addition, a longer extraction time means more soluble substances are released from the coffee grounds, and the components toward the tail end that tend toward off-flavors and bitterness are also extracted. If the espresso bean blend used is a darker roast, the coffee will most likely present an undrinkable burnt-bitter taste, and the overall body will be relatively thin. In the view of most coffee enthusiasts, the "full extraction" here is essentially a cup of "over-extracted Espresso."

Starting with the explosive popularity of Luckin's Coconut Latte in 2021, major brands have gradually incubated more and more milk coffee and fruit coffee categories. The milk-tea-ification of coffee has become a common formula for mainstream brands' innovation, and "sweet" and "not bitter" are the shared labels of such products. As sweet coffee continues to move toward mass appeal, one reality that must be acknowledged is that most Chinese consumers are not accustomed to burnt-bitter pure black coffee. And at this time, Luckin launching a product sold on "bitter coffee taste" is likely hard for office workers who already prefer sweetness and avoid bitterness to accept.

Image source: Luckin official Weibo

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