Dialing In Is a Logged Experiment, Not a Guess

Set a baseline you can compare

Start with a recipe that gives you consistent inputs: a measured dose, a target yield, a reasonable time window, and the equipment you will keep fixed for the first few attempts. The exact values are less important than having a starting point you can describe.

Write down the coffee, roast information if you have it, grinder, machine, dose, yield, time, and temperature. A baseline is not a verdict on the bean. It is a reference for the next decision.

• Use the same basket and equipment for the first comparison.
• Measure output by weight instead of relying only on volume.
• Keep the first note short enough that you will actually write it.

Change one variable at a time

If the shot tastes off, change the variable most likely to explain the result and leave the rest alone. A grind adjustment is easier to learn from when the dose, yield, and equipment have not all moved too.

Do not confuse more activity with more learning. Two comparable shots tell you more than five undocumented attempts that each changed a different part of the recipe.

Record the cup, not only the numbers

Dose, yield, and time explain what you did. Taste explains whether you want to do it again. Note a few plain descriptors—sweetness, acidity, bitterness, body, aftertaste—and one sentence about the overall cup.

You do not need a perfect sensory vocabulary. “Bright but thin” or “heavy and bitter” is already more useful than a number with no context.

Know when the baseline is useful

Stop changing variables when you have a recipe that tastes good enough to repeat and a note that tells you what to try next if the coffee shifts. The goal is not to find a mythical final setting; it is to create a dependable starting point.

Save that result as a recipe before you move on. A good log turns the next session into a small adjustment instead of a reset.