Introduction:Kenyan coffee is renowned for its bright acidity and rich berry flavors. Its unique varietal genetics and double-washed processing method result in a clean, refreshing, and layered cup profile. This article delves into the origins of Kenyan coffee varieties and the K72 processing method, and guides you through the key parameters and practical techniques for making three types of cold brews—iced pour over, cold drip, and cold brew—to help you brew professional-grade Kenyan flavors at home.
The distinctive acidity and berry notes of Kenyan coffee beans stem from the perfect combination of varietals and terroir. In the early 20th century, Bourbon lineage varietals introduced and cultivated by French and British missionaries in Kenya adapted over a century to the local high-phosphate soil environment, developing flavor characteristics distinctly different from those of Central and South American Bourbons. What truly sets Kenyan coffee apart, however, are the SL-28 and SL-34 cultivars—disease-resistant, high-yielding, and known for their vibrant flavor profiles.
The SL series varietals originated in the 1930s when the Kenyan government commissioned the Scott Laboratories (Scott Labs) to conduct coffee breeding research, with the goal of identifying varietals that could adapt to the local climate, possess commercial potential, and be suitable for large-scale cultivation. Among them, SL-28 and SL-34 not only exhibit strong disease resistance but also impart distinct lemon, citrus, grapefruit notes, along with unique berry and floral aromas, making them representative of Kenya’s specialty coffee.
Kenyan coffee is mostly processed using the washed method, paired with precise roasting, which fully highlights its bright acidity and refreshing taste. Among the most iconic processing methods is what the industry calls the “double washed method” or “K72.” The core of this method lies in subjecting the coffee beans to two rounds of fermentation and multiple washes, significantly enhancing the beans’ cleanliness and acetic acid expression, resulting in clearer acidity and more elevated flavors.
The K72 process begins with the flotation and depulping of coffee cherries, followed by placing the parchment beans into an upper fermentation tank for an initial fermentation of about 24 hours—this duration can be adjusted based on ambient temperature, with higher temperatures leading to faster fermentation. After fermentation, most of the mucilage is washed away, and the beans are then transferred to a lower clarification tank for a secondary fermentation lasting 36 hours. It’s important to change the circulating water every few hours during fermentation to prevent spoilage and foul odors. Overall, from fermentation to final sun drying, the K72 process takes at least 48 hours, sometimes even up to 72 hours. This lengthy processing is the key to the intense, clean, and vibrant acidity of Kenyan coffee.
This unique processing method, combined with appropriate roasting, often results in Kenyan coffee exhibiting blackcurrant, grapefruit, and even subtle cherry tomato-like berry notes. Many premium Kenyan beans, such as those from the renowned Asselya Factory, display pronounced and layered acidity, making them ideal for drinkers who enjoy lively acidity in their coffee.
The high acidity and berry flavors of Kenyan coffee make it particularly well-suited for cold coffee preparations. Whether it’s iced pour over, cold drip, or cold brew, each method highlights its refreshing qualities. Below are the practical brewing parameters and operational details for three common cold drinks:
Iced Pour Over Coffee: It is recommended to use 15 grams of coffee grounds with a 1:10 coffee-to-water ratio and a water temperature of around 91°C. Grind size should be medium-coarse (approximately 80% passing through a 0.85 mm sieve). First, extract a highly concentrated coffee liquid, then pre-chill the server (by adding ice to cool it down and then discarding the ice), followed by pouring in 100 grams of ice cubes, and slowly pouring the hot-extracted coffee liquid over the ice to mix. This method extracts a concentrated coffee first and then dilutes it with ice, preserving the layered flavors while enjoying a smooth, chilled mouthfeel. Note that the pre-chilling step helps prevent the ice from melting too quickly, which could lead to over-dilution and affect the flavor.
Cold Drip Coffee: Use 60 grams of coffee grounds with a 1:10 coffee-to-water ratio, aiming to extract 600 milliliters of coffee liquid. Set the dripping speed to approximately 3 drops per 10 seconds, using a mixture of ice and water as the water source in the top chamber. The total extraction time is about 8 hours. After extraction, transfer the coffee liquid into a sealed bottle, refrigerate and let it sit for 48 hours to allow the flavors to further integrate and develop, then serve after taking it out.
Cold Brew Coffee: Use 50 grams of coffee grounds with a 1:10 coffee-to-water ratio. Prepare 400 milliliters of cold water and 200 grams of hard ice (totaling approximately 600 grams of ice-water mixture, considering the coffee grounds absorb about twice their weight in water). Mix all ingredients evenly, seal, and let it sit in the refrigerator for 24 hours. Afterwards, filter out the coffee grounds with paper filters, pour the coffee liquid into a clean sealed bottle, and refrigerate for another 32 hours to allow the flavors to become rounder. This method is suitable for those who prefer low-acidity and full-bodied taste profiles.
The above content is compiled by CoffeeHunters, a coffee news website.
