Almost everyone brews a single-hop beer at some point, and most of those beers teach the brewer almost nothing. The usual failure is not the hop — it is the 4.5% ABV amber malt bill, the American ale yeast fermented warm enough to throw pear esters, the water built for "hoppy beer" with 180 ppm sulphate, and a hopping schedule copied from a NEIPA recipe. Under all that, Citra and Cascade both taste like "citrus IPA". The point of a single-hop brew is analytical: you want the hop to be the loudest thing in the glass by a wide margin, and you want the result to be comparable to the next single-hop beer you brew.
This article is about designing that comparability. The recipe is a measuring instrument, and instruments need to be calibrated.
Know where your hop sits in the population before you weigh anything
The single most useful preparation step costs nothing: look at your variety's numbers against the whole database, not against your memory of the last beer you drank. Across the 329 varieties in the Hopedia corpus, median alpha acid is 8.9%, with the 25th percentile at 6% and the 75th at 12.5%. Median total oil is 1.5 ml/100 g, median myrcene 42.3% of oil, median humulene 18.5%, median cohumulone 28.5% of alpha.
Put Saaz (CZ) against that background and the scale of the problem becomes obvious. At 2–5% alpha it sits below the 10th percentile (4.3%); at 0.4–1 ml/100 g of oil it is at or under the corpus 10th percentile of 0.8 ml. To deliver the same absolute mass of hop oil into the kettle as a mid-range Citra batch, you would need roughly two and a half to three times the hop weight. Meanwhile Saaz's farnesene content of 14–20% puts it in the top few percent of the entire database: the corpus median farnesene is just 0.5%, and even the 90th percentile is 9.5%. That single number — the green, linden-blossom, faintly woody farnesene signature — is most of what people mean when they say "noble character", and it is genuinely rare. Only about a tenth of catalogued varieties carry meaningful amounts of it.
Contrast that with Nelson Sauvin, whose humulene at 25–37% sits around the 75th–90th percentile while myrcene (20–45%) falls below the median. That inverted ratio — more humulene than you expect relative to myrcene — is why Nelson does not read as a straightforward "dank citrus" hop and instead pushes into white wine, gooseberry and crushed grape. Knowing this before you brew tells you what to look for; it also tells you not to blast it with a 5 g/L whirlpool that will simply flatten everything into generic fruit.
Four varieties, four completely different design problems
The table below is the whole argument in compressed form: the same "single-hop pale beer" plan cannot serve all four, because the raw material differs by a factor of three or more on almost every axis.
| Variety | Alpha (%) | Total oil (ml/100 g) | Myrcene / humulene (% oil) | Cohumulone (% alpha) | Position vs. corpus |
|---|---|---|---|---|---|
| Citra | 10–15 | 1.5–3 | 60–70 / 7–13 | 20–35 | Alpha ~p75–p90; oil at/above median; myrcene ≥p90 |
| Nelson Sauvin | 10–13 | 0.8–1.5 | 20–45 / 25–37 | 20–25 | Alpha ~p75; oil p10–median; humulene p75–p90 |
| Cascade | 4.5–9 | 0.7–2.5 | 45–60 / 8–20 | 30–40 | Alpha p10–median; cohumulone ~p75 |
| Saaz (CZ) | 2–5 | 0.4–1 | 25–40 / 15–30 | 23–26 | Alpha ≤p10; oil ≤p10; farnesene 14–20% ≈ top 5% |
Note also the cohumulone spread. Cascade's 30–40% straddles the corpus 75th percentile (35%), while Nelson Sauvin's 20–25% is around the 10th–25th. If you bitter both to 35 IBU in the same base beer, the Cascade version will read as slightly sharper and more assertive in the finish. That is a real, reproducible difference and it is worth tasting deliberately rather than blaming on your water.
| — | Citra | Nelson Sauvin | Cascade | Saaz (CZ) |
|---|---|---|---|---|
| Total oil | 1.5–3 ml | 0.8–1.5 ml | 0.7–2.5 ml | 0.4–1 ml |
| Myrcene | 60–70% | 20–45% | 45–60% | 25–40% |
| Caryophyllene | 5–8% | 6–11% | 3–9% | 6–9% |
| Humulene | 7–13% | 25–37% | 8–20% | 15–30% |
| Farnesene | 0–1% | 0–1% | 3–9% | 14–20% |
The base beer: a deliberately boring canvas
Your reference recipe should be the same every single time, so that differences between batches are attributable to the hop. A workable standard:
- Grist: 90–100% Pilsner or pale ale malt, up to 5% wheat or a very light Carapils for foam. No crystal malt above 2%, no Munich above 5%. Colour target 4–7 EBC.
- OG / ABV: 1.044–1.048 (11–12 °P), giving 4.5–5.0% ABV. High enough for body, low enough that alcohol warmth does not mask aroma.
- Mash: 66–67 °C for 60 min, final gravity 1.008–1.010, apparent attenuation 78–80%. Avoid ultra-dry 1.004 finishes; they exaggerate bitterness perception by several perceived IBU.
- Water: balanced, not "hop-forward". Target sulphate 100–120 ppm, chloride 60–75 ppm (roughly 1.5:1), calcium 80–100 ppm, mash pH 5.3–5.4. A 3:1 sulphate-heavy profile makes every hop taste drier and more mineral, which is exactly the variable you are trying to hold constant.
- Yeast: clean and low-ester. US-05 / Chico at 18–19 °C, or a clean kölsch strain at 16 °C. For lager-oriented varieties, a 34/70-type strain at 12 °C. Pitch at proper rate (0.75 M cells/mL/°P for ale) — underpitched fermentations throw fusels and fruity esters that you will mistakenly attribute to the hop.
Ferment the same way, package the same way, and taste at the same age. Hop aroma in a dry-hopped pale beer changes measurably between day 7 and day 28 in the keg; comparing a week-old Citra beer to a month-old Cascade beer is not an experiment, it is a mood.
Dosage: think in grams per litre, and in oil delivered
IBU targets should be modest and, crucially, identical across your series — 25–30 IBU for a pale beer of this strength. That means the bittering charge changes weight from hop to hop. With Citra at 13% alpha you might need 1.6 g/L at 60 minutes; with Saaz at 3.5% you would need close to 6 g/L for the same IBU, which is both expensive and starts contributing vegetal polyphenols. For low-alpha varieties, bitter to the lower end (22–25 IBU) or accept a first-wort hop charge instead.
Late additions are where the variety actually speaks. A usable framework:
| Stage | Timing / temp | Dose (g/L) | What it shows you |
|---|---|---|---|
| Bittering | 60 min boil | to 25–30 IBU | Bitterness quality: cohumulone, harshness, length |
| Flameout / hop stand | 10 min at 80 °C | 2–3 | Oxygenated terpenoids: floral, spicy, "noble" character |
| Whirlpool (hot) | 15 min at 90 °C | 2–4 | Rounder, jammier fruit; some myrcene loss |
| Dry hop | 3 days, 18–20 °C, at terminal gravity | 3–5 | Raw varietal signature, thiols, most volatile fraction |
Scale the dose inversely to oil content. A 4 g/L dry hop of Citra (say 2.2 ml/100 g oil) delivers roughly 88 µl of oil per litre; the same 4 g/L of Saaz at 0.7 ml/100 g delivers 28 µl — about a third. If you want comparable intensity you need something like 10–12 g/L of Saaz, at which point you are in "hop burn" territory for a delicate noble variety and will extract grassy polyphenols. The honest answer is that low-oil hops should be compared at equal weight in a lager-style beer and simply accepted as quieter; matching intensity across Citra and Saaz is not a meaningful goal.
| — | Citra | Cascade | Saaz (CZ) |
|---|---|---|---|
| Alpha acid | 10–15% | 4.5–9% | 2–5% |
Two protocols that actually teach
The split-batch protocol
Brew 20–23 L of the base beer, split into two fermenters after chilling, pitch the same yeast from the same starter, and dry hop each with a different variety at the same g/L. This removes every variable except the hop. It is the only way to reliably detect that, say, Cascade's grapefruit sits higher and thinner than Citra's, which leans peach and melon at the same dose.
The dry-hop tea, before you brew
Before committing 20 L, calibrate your nose. Take 2 g of pellets per 500 ml of a neutral commercial pale lager, seal, hold 24 h at 4 °C, then strain and taste against a control from the same can. This approximates a 4 g/L cold dry hop. It will not predict whirlpool character (that is a different set of oxidised compounds) but it is a superb three-hour way to learn what a variety's raw aroma is, and it will save you from a 20 L beer you dislike.
Tasting with a structure
Freeform "I like it" notes are worthless three months later. Score each beer on the same axes, 1–5: citrus, stone/tropical fruit, floral, herbal/spicy, pine/resin, earthy, grassy, and separately rate bitterness intensity, bitterness quality (smooth to harsh), and aroma persistence in the empty glass. The corpus aroma tags hint at what to expect — citrus appears on 142 of 329 varieties, floral on 114, spicy on 93 — so simply writing "citrus" identifies almost nothing. Push for the specific: grapefruit (50 varieties), lime (33), tangerine (25), passion fruit (32).
A single-hop beer is worth brewing once per variety. A single-hop protocol — same grist, same water, same yeast, same g/L, same tasting sheet — is worth brewing for years, because every new batch adds a comparable data point to the ones before it.
A sensible first series
If you want a series that maps the flavour space rather than four versions of the same beer, pick varieties that are far apart in the corpus. Citra (myrcene ≥ p90, high oil) versus Nelson Sauvin (humulene p75–p90, moderate oil) versus Cascade (mid-alpha, high cohumulone, classic American) versus Saaz (bottom decile alpha and oil, top-percentile farnesene) covers roughly the full diagonal of the database. Brew them in that order over a few months, keep the base beer frozen in place, and by the fourth batch you will have something most brewers never acquire: an internal reference scale.