Dialing In: How to Fix a Coffee Recipe One Change at a Time
What “Dialing In” Means
Every new bag of coffee brews a little differently. Dialing in means adjusting your recipe until that bag tastes its best, usually in two to four brews.
You only need to understand four controls, two ideas and one rule: change one thing at a time.
The Four Controls
| Control | What it is | What it does |
|---|---|---|
| Brew ratio | Grams of coffee to grams of water (or of espresso out) | Mainly sets strength |
| Grind size | How fine the coffee is ground | Mainly sets extraction and brew time |
| Time | How long water and coffee are in contact | Longer pulls out more |
| Temperature | How hot the water is | Hotter pulls out more |
Grind and time are linked: finer coffee slows the water and lengthens the brew, so you usually adjust grind and then check the time.
Extraction vs Strength
These two ideas explain almost every bad cup.
Extraction is how much of the coffee you dissolved out of the grounds. Water pulls out acids and fruity flavors first, then sugars, then bitter, drying compounds last.
- Under-extracted: you stopped too early. The cup tastes sour, salty, thin, and finishes short.
- Over-extracted: you went too far. The cup tastes bitter, dry, harsh, and leaves your mouth feeling astringent.
- Balanced: sweet, with acidity that tastes juicy rather than sour.
Strength is how concentrated the drink is: how much coffee is dissolved in the water you drink. A cup can be well extracted but too weak (watery, but pleasant), or well extracted but too strong (heavy and intense).
For reference, the SCA’s brewing chart puts a “balanced” filter coffee at about 18–22% extraction and 1.15–1.35% strength (TDS, or total dissolved solids). You do not need a meter to use this: your tongue tells you which side you are on. Sour means extract more; bitter means extract less; watery or too intense means change the ratio.
Tip: Sour and bitter are easy to mix up at first. Sourness is sharp and hits the sides of your tongue, like lemon juice. Bitterness lingers at the back, like strong black tea or burnt toast.
Starting Recipes
Start from a known recipe, then adjust.
| Filter (pour-over) | Espresso | |
|---|---|---|
| Dose | 15 g | 18 g |
| Water or yield | 250 g water (about 1:16.7) | 36 g espresso out (1:2) |
| Grind | Medium-fine, like coarse sand | Fine, like powdered sugar or finer |
| Time | 2:45–3:30 total | 25–30 seconds from starting the pump |
| Temperature | 200–205 °F (93–96 °C) | About 200 °F (93 °C) |
For full method details, see the pour-over , French press and AeroPress guides.
Troubleshooting: Filter Coffee
| It tastes… | Brew time | Change first | Then, if needed |
|---|---|---|---|
| Sour, thin, salty | Fast | Grind finer | Hotter water |
| Sour, but time is normal | Normal | Hotter water (205 °F / 96 °C) | Grind a little finer |
| Bitter, dry, harsh | Slow | Grind coarser | Cooler water |
| Bitter and sour at once | Very slow or uneven | Grind coarser; pour more evenly | Check grinder for fines |
| Pleasant but weak | Normal | More coffee (e.g. 16 g) | — |
| Pleasant but too strong | Normal | Less coffee or more water | — |
| Flat, papery, no flavor | Any | Fresher beans | Rinse the filter |
Troubleshooting: Espresso
Weigh both the dose and the shot. Keep the dose and yield fixed, and change the grind first.
| It tastes… | Shot time | Change first | Then, if needed |
|---|---|---|---|
| Sour, thin, salty | Fast (under 25 s) | Grind finer | Longer ratio (e.g. 1:2.2) |
| Sour, but time is normal | 25–30 s | Longer ratio (more yield) | Hotter water |
| Bitter, harsh, dry | Slow (over 30 s) | Grind coarser | Shorter ratio (e.g. 1:1.8) |
| Balanced but weak, watery | Normal | Shorter ratio (less yield) | Dose up 0.5–1 g |
| Balanced but too intense | Normal | Longer ratio (more yield) | — |
| Spurts, channels, uneven | Any | Distribute and tamp evenly | Fresher beans |
Light roasts are harder to extract and often like a finer grind, hotter water or a longer ratio. Dark roasts extract easily and turn bitter fast, so go coarser or cooler (how roast level changes brewing ).
How to Run It
- Brew the starting recipe and write down every number.
- Taste and place it: sour or bitter? Weak or strong?
- Make one change, and make it small: one or two grinder steps, 1 g of coffee, or 5 °F (3 °C).
- Brew again and compare. If it got better, keep going in that direction. If it got worse, you overshot; go halfway back.
- Stop when you like it, and write the recipe on the bag.
Beans change as they age, so expect to grind a little finer over the weeks (why freshness matters ).
Wrap-Up
Fix extraction with the grind, fix strength with the ratio, and only touch temperature when those are close. One change per brew, notes every time.