同一支豆子，為什麼只改15g、20g，風味就像換了一支豆？ Why Does Changing Just from 15g to 20g Make the Same Bean Taste Like a Completely Different One?
目錄：
1. 同樣的TDS，不代表同樣的風味結構
2. 第一個關鍵就是粉床厚度
3. 第二個關鍵就是注水容錯率
很多人在手沖時會以為，只要比例一樣，味道就應該差不多。像同一支豆子，同樣用 1:16 的粉水比，15克配240克水，20克配320克水，看起來只是份量不同，理論上風味應該接近。但真正沖起來，結果往往不是如此。很多時候，明明是同一支豆子，喝起來卻像換了一支豆。
這次我們以 巴拿馬 翡翠莊園 綠標 私藏精選 Canas Verdes 藝妓 日曬 為例。這支豆子的杯測風味是: 桃子、香檳葡萄、甜莓、蜜香紅茶，尾韻帶有花蜜與桃子綿延。也就是說，它不只是要有明亮果香，更重要的是後段要有甜感支撐，才能把整體的高級感完整撐起來。
Many people assume that as long as the ratio stays the same, the flavor should be roughly identical when pour-over brewing. For example, using the same bean at a 1:16 coffee-to-water ratio, 15g coffee with 240g water versus 20g with 320g water, seems like it’s just a difference in volume. In theory, the flavor profile should be similar. But in reality, when you actually brew them, the results are often strikingly different. Very frequently, it’s clearly the same bean, yet it tastes like you’ve switched to an entirely different one.
Let’s take this specific bean as an example: Panama Emerald Estate Green Label Private Selection Canas Verdes Geisha Natural. Its cupping notes are: peach, champagne grape, sweet berry, honey-scented black tea, with a lingering finish of floral nectar and extended peach sweetness. In other words, it’s not just about bright fruit aromatics, it crucially needs solid sweetness in the mid-to-late stages to fully support its premium, elegant character.
同樣的TDS，不代表同樣的風味結構
實際沖煮時，同樣沖到 TDS 1.1，卻出現很明顯的差異。
20克那杯，喝起來是: 厚實甘甜，尾韻酸甜；
15克那杯，喝起來是: 清甜、酸感較多，尾韻帶酸苦。
這組結果很值得思考，因為它清楚說明了一件事：同樣的TDS，不代表同樣的風味結構。
TDS 代表的是濃度，也就是杯中溶解物的總量差不多，但它並不會告訴你，溶解出來的內容是偏向甜感、花蜜、果香，還是偏向酸質、收斂感與尾段苦韻。也就是說，20克那杯的 1.1，可能更多是來自較完整的中後段甜感與厚度；而15克那杯的 1.1，則可能前段酸質較明亮，但中段支撐不足，到了尾段還多帶出一點酸苦。
When brewed to the same TDS of 1.1%, there’s a very noticeable difference:
The 20g cup: Mellow, rich sweetness with an acidic-sweet finish.
The 15g cup: Clean sweetness with more pronounced acidity, and a finish that carries some sour-bitter notes.
This contrast is worth reflecting on because it clearly illustrates one key point: The same TDS does not mean the same flavor structure.
TDS measures concentration—the total amount of dissolved solids in the cup is similar—but it doesn’t tell you what was dissolved: whether it leans toward sweetness, floral nectar, and fruit aromatics, or toward acidity, astringency, and lingering bitterness. In other words, the 1.1% in the 20g cup likely comes more from a fuller mid-to-late sweetness and body; the 1.1% in the 15g cup might emphasize brighter front-end acidity, but with weaker mid-palate support, leading to a slightly sour-bitter tail.
為什麼會這樣？
Why does this happen?
第一個關鍵，就是 粉床厚度。
20克的粉層較厚，熱水穿過咖啡粉時，接觸路徑更長，整體流速也通常更慢，萃取自然較容易往甜感、厚度與尾韻延續發展。因此這杯更能呈現出翡翠日曬藝妓該有的 花蜜感、甘甜感與桃子綿延。相反地，15克粉床較薄，水更容易快速穿過，因此前段的桃子、葡萄、清甜酸值較容易被拉出來，但如果中後段沒有延續，風味就會變成前亮後空，甚至在尾韻出現些微酸苦。
First key factor: Bed thickness.
With 20g, the coffee bed is thicker. As hot water passes through, the contact path is longer, flow rate is typically slower, and extraction naturally trends toward sweetness, body, and extended finish. This allows the cup to better express the floral nectar, rich sweetness, and lingering peach that define this Emerald Natural Geisha. In contrast, the 15g bed is thinner, so water passes through more quickly. This pulls out the front-end peach, grape, and clean bright acidity more easily, but without strong continuation in the mid-to-late stages, the flavor becomes “bright upfront, hollow in the middle,” and can even develop subtle sour-bitter notes in the finish.
第二個差異，是 注水容錯率。
20克粉量較多，粉床較穩，對水柱大小、注水位置、擾動強弱的容忍度通常比較高，所以整體更容易維持完整與飽滿。15克因為粉床薄，若水柱略大、繞圈稍多，或後段注水衝擊太強，就更容易改變水路，讓萃取不均，於是酸值雖然明亮，尾韻卻可能收得不夠漂亮。
Second difference: Pouring tolerance.
A larger 20g dose creates a more stable bed, which is generally more forgiving of stream size, pour positioning, and agitation strength, making it easier to achieve completeness and fullness overall. With 15g, the thinner bed is more sensitive: a slightly larger stream, wider circles, or overly aggressive late pours can easily disrupt flow paths, causing uneven extraction. Acidity may shine brightly, but the finish often doesn’t land as cleanly.
所以，15克與20克的差異，並不是單純「濃一點」或「淡一點」而已，而是整杯咖啡的 風味重心改變了。15克像是把這支豆子的上半身拉出來，香氣、酸值、清透感更鮮明；20克則像是把下半身補齊，甜感、厚度、結構與餘韻更完整。對這支翡翠綠標 Canas Verdes 日曬藝妓來說，實測結果也顯示，20克更能把這支豆子的高級甜感與尾韻撐出來；而15克雖然有更清亮的表現，卻容易出現前段漂亮、後段撐不住的現象。
這也是手沖最迷人的地方。同一支豆子，改變的不是身分，而是它被表達的方式。當你把粉量從15克改成20克時，改變的不只是份量，而是整個萃取路徑、風味排序與杯中重心。也因此，看似只差5克，喝起來卻像換了一支豆。
So the difference between 15g and 20g isn’t simply “stronger” vs. “weaker,” it’s a fundamental shift in the flavor center of gravity of the entire cup. 15g pulls out the “upper body” of the bean: more prominent aromatics, acidity, and transparency. 20g fills in the “lower body” and make it a whole: richer sweetness, body, structure and aftertaste are more complete. For this Emerald Green Label Canas Verdes Natural Geisha, tests show that 20g better supports its premium sweetness and lingering finish, while 15g delivers a clearer, brighter expression but often struggles to hold up in the back end—beautiful upfront, but unable to sustain.
This is one of the most enchanting aspects of pour-over. With the same bean, what changes isn’t its identity, it’s the way it’s expressed. When you adjust the dose from 15g to 20g, you’re not just changing quantity; you’re altering the entire extraction pathway, the sequencing of flavors, and the balance within the cup. That’s why a seemingly small 5g difference can make it taste like you’ve switched beans entirely.
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