Introduction:Want to understand how different water temperatures affect the flavor profile when brewing Costa Rica La Bella Vista Geisha using pour over? This hands-on test report conducts step-by-step extractions across four temperature ranges from 90°C to 93°C, using medium-fine grind and a 1:15 coffee-to-water ratio, to observe the shift from a full-bodied, high-temperature fruit tea to a brighter, lower-temperature one. Whether you're a beginner or a seasoned enthusiast, you can find your optimal extraction strategy through parameter settings and actual taste comparisons.
The Geisha coffee beans produced by Costa Rica La Bella Vista Estate are widely praised for their pronounced floral notes and unique bergamot and berry profiles. The green coffee beans have a light green, elongated appearance, differing from typical grassy varieties, and emit a fresh fruity aroma upon opening the bag. For this experiment, we used a medium-fine grind (approximately 58% passing rate through a Chinese standard No. 20 sieve), a 1:15 coffee-to-water ratio, and consistent step-brewing techniques to test the impact of four different water temperatures—93°C, 92°C, 91°C, and 90°C—on flavor.
At the high temperature of 93°C, the brew started with a 30-second bloom using 32 grams of water, followed by sequential pours to reach 127 grams and then 227 grams to complete the extraction, with a total brew time of about 2 minutes. This set exhibited a rich flavor profile, dominated by citrus and berries, along with a distinct oolong tea base note and a tea-like astringency in the finish. The overall mouthfeel was full-bodied but relatively focused in layers, making it suitable for those who prefer a heavier texture.
When the temperature was lowered to 92°C, the bloom water was adjusted to 31 grams, with step pours at 125 grams and 225 grams, and a total extraction time of about 1 minute and 59 seconds. At this temperature, cupping revealed a more balanced expression of floral notes and oolong tea base, accompanied by soft plum and citrus tones, with a hint of creamy smoothness in the aftertaste. The flavor layers were slightly more expanded, while the mouthfeel maintained a certain body.
As the water temperature dropped further to 91°C, 34 grams of water were used for blooming, followed by a slow pour of 96 grams of water, then stepped to 130 grams and 225 grams to complete extraction, with a total brew time of about 1 minute and 56 seconds. This set showcased more vibrant floral and citrus notes, paired with fresh lemon and oolong tea undertones. The finish clearly highlighted the lingering bergamot aftertaste. Overall, the flavors leaned brighter, with a refreshing and well-defined layered mouthfeel.
The lowest temperature group at 90°C also began with a 34-gram bloom, followed by pouring to 130 grams and 225 grams to complete the brew, maintaining a 1 minute and 56-second extraction time. At this temperature, floral characteristics were most pronounced, with an immediate burst of bright acidity and sweetness from lemon and fruit tea, accompanied by a creamy richness and honey-like sweetness. The aftertaste had a notable sweet finish. The overall performance was light yet dynamic, making it highly suitable for coffee lovers who enjoy delicate flavors.
Comparing all four groups, it's evident that the high-temperature range (93°C and 92°C) delivered a fuller body and richer tea-like depth, though with a relatively simpler flavor structure. In contrast, the low-temperature range (91°C and 90°C) revealed a more diverse array of fruit and floral notes, with a refreshing mouthfeel and long-lasting aftertaste. If you prefer a bold and steady coffee experience, try extracting at 92°C to 93°C. For those seeking a bright, fruit tea-like profile with vibrant acidity, a water temperature between 90°C and 91°C is recommended, with adjustments to grind size and pouring speed to optimize extraction efficiency.
The above content is compiled by CoffeeHunters, a coffee news website.
