Introduction:Rum barrel-fermented coffee has become a hot topic in recent years, but did you know this innovation actually originated in Colombia? This article delves into how Finca Santa Rosa combines rum oak barrels with the Castillo variety through low-temperature fermentation to create unique flavors of liquor-filled chocolate and tropical fruits. From regional environment, processing details to V60 pour over parameters, we provide a practical guide to help you fully experience the charm of this distinctive coffee.

In the world of specialty coffee, beans with wine-like aromas always bring surprises. Finca Santa Rosa in the Caldas region of Colombia began experimenting years ago with fermenting green coffee beans in aged rum oak barrels, creating a uniquely memorable coffee experience.

Located at an altitude of 1,750 meters, Finca Santa Rosa boasts fertile volcanic soil and stable climatic conditions. The Castillo variety grown here is carefully selected and first undergoes a washed process to remove the pulp, followed by a unique fermentation stage. Unlike the standard washed process, these coffee beans are placed in rum oak barrels with over eight years of barrel age and left to ferment at a low temperature of around 15–20°C for up to three months.

During fermentation, the farm workers turn the beans daily to ensure even contact with the barrel walls and take flavor samples every 30 days to closely monitor the degree of wine aroma absorption, avoiding both over- and under-absorption. This winemaking-like technique allows the coffee beans to gradually absorb the fragrance of the oak barrels while retaining the bright acidity and rich body characteristic of the Castillo variety.

The Caldas region, one of Colombia’s “coffee triangle” areas, features altitudes and microclimates that give its coffee a distinctive vanilla note and smooth acidity. The harvest season here is mainly divided into the main season from September to December and the secondary season from April to May. Finca Santa Rosa chooses to harvest when the fruit is at its peak ripeness to ensure raw material quality.

After three months of fermentation, the coffee beans are transferred to a greenhouse environment for drying. The constant temperature and humidity in the greenhouse effectively prevent the over-fermentation issues that may arise from traditional African bed sun drying, ensuring the final green beans retain a clean and refreshing flavor profile. In cupping, this coffee shows a distinct liquor-filled chocolate base tone, accompanied by the aroma of rum, the vibrant acidity of tropical fruits, and a long-lasting maple-like sweetness in the aftertaste.

In terms of roasting performance, it is recommended to present its rich aroma layers with a medium-light roast. The tested roasting parameters are: charge temperature 190°C, initial flame power 140, air damper set to 3; turning point at about 1 minute 42 seconds, when the roaster temperature drops to 140°C, adjust the air damper to 4; when the bean surface turns yellow (around 151.8°C), reduce the flame power to 120 to enter the stable dehydration stage. First crack begins at 9 minutes 07 seconds, continues developing for 2 minutes 10 seconds, and the beans are dropped at 195°C, at which point the bean surface shows an ideal amber color and clear cracking patterns.

For pour over, it is recommended to use a Hario V60 dripper, with a coffee-to-water ratio of 1:15, water temperature controlled at 91°C, and grind size approximately EK43s setting 10 (equivalent to 80% passing rate on a #20 sieve). The step-by-step extraction process is as follows: the first stage involves pouring 30g of water for a 30-second bloom to form a uniform “hamburger”-shaped coffee bed; the second stage pours up to 125g at 1 minute, continuing the pour when the water level drops to two-thirds of the coffee bed; the third stage pours up to a total of 225g at 1 minute 40 seconds, and once the coffee liquid has completely dripped through, the total extraction time is about 1 minute 59 seconds. These parameters fully showcase the balance between wine aroma and fruity tones.

The brewed coffee initially offers a rich fermented wine aroma; upon tasting, the mellow notes of rum and nuttiness come through first, followed by the acidity of tropical fruits and an oolong tea-like aftertaste, with a natural sweetness and creamy-smooth texture in the finish. The overall flavor structure is complete and layered, making it highly suitable for coffee enthusiasts who enjoy exploring special processing methods to savor in depth.

The above content is compiled by CoffeeHunters, a coffee news website.